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Tuning the exciton binding energy of covalent organic frameworks for efficient photocatalysis
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Zhangjie Gua, Zhen Shana, Yulan Wangb, Jinjian Wanga, Tongtong Liua, Xiaoming Lic, Zhiyang Yub, Jian Sua, *, Gen Zhanga, d, *
Chinese Chemical Letters | 2024, 35(2) : 108356
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Chinese Chemical Letters | 2024, 35(2): 108356
• Communication •
Tuning the exciton binding energy of covalent organic frameworks for efficient photocatalysis
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Zhangjie Gua, Zhen Shana, Yulan Wangb, Jinjian Wanga, Tongtong Liua, Xiaoming Lic, Zhiyang Yub, Jian Sua, *, Gen Zhanga, d, *
Affiliations
  • a Key Laboratory for Soft Chemistry and Functional Materials of Ministry of Education, School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
  • b State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fuzhou 350002, China
  • c MIIT Key Laboratory of Advanced Display Material and Devices, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
  • d Key Laboratory of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences, Lanzhou University, Lanzhou 730000, China
Published: 2024-02-15 doi: 10.1016/j.cclet.2023.108356
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Owing to the large exciton binding energy (>100 meV) of most organic materials, the process of exciton dissociation into free electrons and holes is seriously hindered, which plays a key role in the photocatalytic system. In this study, a series of chalcogen (S, Se)-substituted mesoporous covalent organic frameworks (COFs) have been synthesized for enhanced photocatalytic organic transformations. Photoelectrochemical measurements indicate that the introduction of semi-metallic Se atom and the enlargement of conjugation degree can not only reduce the exciton binding energy accelerating the charge separation, but also reduce the band gap of COFs. As a result, the COF-NUST-36 with the lowest exciton binding energy (39.5 meV) shows the highest photocatalytic performance for selective oxidation of amines (up to 98% Conv. and 97.5% Sel.). This work provides a feasible method for designing COFs with high photocatalytic activity by adjusting exciton binding energy.

Covalent organic frameworks  /  Exciton binding energy  /  Atom substitution  /  Extended conjugation  /  Photocatalysis
Zhangjie Gu, Zhen Shan, Yulan Wang, Jinjian Wang, Tongtong Liu, Xiaoming Li, Zhiyang Yu, Jian Su, Gen Zhang. Tuning the exciton binding energy of covalent organic frameworks for efficient photocatalysis[J]. Chinese Chemical Letters, 2024 , 35 (2) : 108356 - . DOI: 10.1016/j.cclet.2023.108356
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Solar energy is the main source of many energies on the earth, featuring the advantage of clean and renewable. Converting solar energy into chemical energy in the form of higher-value chemicals has aroused intensive interest [1–4]. The key to successful implementation of this process lies in the use of light and rationally design of photocatalysts [5–7]. During the past decades, various advanced photocatalysts, such as TiO2, BiVO4, g-C3N4 and COFs [8,9] have been designed and prepared. Among them, the limited structural designability and narrow visible light absorption range of TiO2, BiVO4 and g-C3N4 impede their further applications. COFs are a completely designed crystalline material with low density, excellent stability, functional diversity, and tunable electric structures [10–14]. With these features, COFs have emerged as a promising platform for potential applications in photocatalytic hydrogen evolution [15–17], carbon dioxide reduction [18,19], degradation of pollutants [20,21] and organic transformations [22–26]. Unfortunately, owing to the partial crystallinity, inefficient charge separation and limited electron transport capability, the photocatalytic performance of COFs is undesirable. In particular, the charge separation is a crucial factor in photocatalytic process. However, the generation and separation efficiency of charge carriers is directly related to exciton binding energy (Eb) in strong exciton system [27]. The Coulomb interactions that stabilize the exciton with regard to electrons and holes referred to as the Eb [28] and the evaluation of Eb is based on an investigation of the quenching of the integrated photoluminescence (PL) intensity with the temperature [29]. In fact, most of the COFs belong to strong exciton system, and they possess a high Eb (typically Eb >100 meV) [30]. It means that the COFs will firstly generate electron-hole pairs bound by Coulomb interactions, namely the Frenkel exciton [28,31], in the process of photocatalysis. The strong Coulomb interactions of the Frenkel exciton will lead to exciton annihilation, seriously hampering the generation of electrons and holes [32–34]. Hence, minimizing the Eb of the COFs to obtain high photocatalytic activity is very attractive but remains a challenge.
To date, many efforts have been dedicated to minimizing the value of Eb in organic photocatalysts [35,36]. Wang and co-authors had realized the reduction of Eb (88 meV) by regulating charge-transfer pathway in linear conjugated polymers [37]. Yin and co-authors had proposed an effective approach to reduce the Eb (338 meV) of carbon nitrides (PCN) via a method of regulating spin-polarized electrons for photocatalysis hydrogen production [38]. Although these photocatalysts can effectively reduce the value of Eb in amorphous polymers, it is difficult to understand the relationship between tailor-made structure and exciton behaviors. Recently, inspired by the low Eb of solar cells with donor (D)-acceptor (A) structure, Gu and colleagues had built four D-A COFs to minimize the Eb (50.4 ± 1.8 meV) [27]. Unfortunately, the unique structure will lead to rapid reverse charge recombination concurrently [39]. Therefore, it is imperative to propose a new strategy to design photocatalysts with long-range ordering and low Eb.
As a proof-of-concept, we propose a strategy of single atom substitution and increasing conjugation degree to reduce Eb of COFs for the first time. As well known, thiophene and selenophene-based materials have excellent photoelectric properties, which are widely used in organic field-effect transistors [40] and solar cells [41,42]. Compared with thiophene, selenophene has stronger ability of electron supplication. In addition, intermolecular Se…Se interaction is conducive to charge transfer. Herein, three chalcogen (S, Se)-contained mesoporous COFs (COF-NUST) were synthesized starting from a planar conjugated pyrene moity [43]. Photoelectrochemical measurements reveal that the Eb values and band gaps of COF-NUST were gradually decreased with the substitution of S atoms by Se atoms and the conjugation degree increased. Impressively, the COF-NUST-36 shows a quite low Eb (39.5 meV) among reported pristine COFs [27,44,45], which is even close to some inorganic semiconductors, such as MoS2 [46], GaN [47] and metal-halide perovskites [29,48]. Consequently, the rare example of selenophene-based COF [49], COF-NUST-36 shows effective exciton splitting and the highest photocatalytic activity in the selective oxidation of amines.
The COF-NUST were synthesized by linking TAPP to different building blocks, BTDC, BSDC and EBSDC in the solvothermal condition (Fig. 1). In detail, COF-NUST-34 and COF-NUST-35 were synthesized by the Schiff-base reaction of TAPP and BTDC or BSDC in the presence of 6 mol/L acetic acid using o-dichlorobenzene (o-DCB) and n‑butyl alcohol (n-BuOH) as solvent at 120 ℃ for 72 h. COF-NUST-36 was synthesized similar to COF-NUST-34 except that EBSDC, mesitylene and benzyl alcohol were used.
The formation of COF-NUST were evidenced by various analytical methods. Fourier transform infrared (FT-IR) spectra (Figs. S6-S8 in Supporting information) revealed the —C═N— stretching vibrations of COF-NUST-34, COF-NUST-35 and COF-NUST-36 were located at 1610, 1646 and 1648 cm−1, respectively, while the amino stretching vibration peak (~3335 cm−1) and the carbonyl stretching vibration peak (~1688 cm−1) from the building blocks were almost disappeared, indicating the conversion of aldehyde and amino groups. The solid-state 13C NMR spectra (Figs. S9-S11 in Supporting information) also confirmed the formation of —C═N— bond, which at 152, 158, 159 ppm corresponding to COF-NUST-34, COF-NUST-35 and COF-NUST-36, respectively. The element compositions of COF-NUST were confirmed by X-ray photoelectron spectroscopy (XPS). From the total spectra, we can clearly observe the characteristic peaks of C 1s, N 1s and S 2p for COF-NUST-34 (Fig. S12 in Supporting information). For COF-NUST-35 and 36 (Figs. S13 and S14 in Supporting Information), the characteristic peaks of C 1s, N 1s and Se 3d were observed. The N 1s spectra of all COF showed typical peaks, located at 398.8, 399.4 and 399.2 eV, which is ascribed to —C═N— bond in COF-NUST-34, COF-NUST-35 and COF-NUST-36, respectively. All these results manifest the successful synthesis of COF-NUST.
The precise periodical structures of COF-NUST-34, COF-NUST-35, and COF-NUST-36 were verified by powder X-ray diffraction (PXRD) together with structural simulations. The intensive peaks were observed in Figs. 2a-c, indicating the high crystallinity of COF-NUST. The PXRD pattern of COF-NUST-34 exhibited distinguishable peaks at 2θ = 3.29°, 4.84°, 6.59°, 9.89°, 13.49°, which are assigned to the (110), (200), (220), (330) and (060) planes. COF-NUST-35 exhibited similar distinguishable peaks at 2θ = 3.27°, 4.40°, 4.84°, 6.54°, 9.82°, corresponding to the (110), (200), (020), (220) and (330) planes. The diffraction peaks of COF-NUST-36 at 2θ = 3.12°, 4.62°, 6.26°, 9.39° were assigned to the (110), (200), (220) and (330) planes. According to the similar structure reported in the previous literature, the AA and AB stacking crystal models were generated, the experimental diffraction patterns of COF-NUST matched well with AA stacking (Fig. S15 in Supporting information). Pawley refinement was conducted to obtain the unit cell parameters (a = 41.96 Å, b = 39.32 Å, c = 3.29 Å, α = 90°, β = 60.77°, γ = 90°, Rwp = 7.66%, Rp = 5.94% for COF-NUST-34; a = 44.80 Å, b = 36.46 Å, c = 3.16 Å, α = 90°, β =63.46°, γ = 90°, Rwp = 7.33%, Rp = 5.37% for COF-NUST-35; a = 44.00 Å, b = 41.90 Å, c = 3.53 Å, α = 90°, β = 60.12°, γ = 90°, Rwp = 6.13%, Rp = 4.53% for COF-NUST-36).
The porosity of COF-NUST-34, COF-NUST-35 and COF-NUST-36 was assessed by N2 sorption isotherm at 77 K (Figs. 2d-f). The type Ⅳ pattern of COF-NUST indicated that COF-NUST are mesoporous material. The Brunauer–Emmett–Teller surface areas were 1098.7, 1163.1 and 677.7 m2/g for COF-NUST-34, COF-NUST-35 and COF-NUST-36, respectively. Although the skeleton structures of COF-NUST were similar, the crystallinity and framework integrity of COF-NUST-36 obtained by EBSDC were inferior to those of COF-NUST-34 and COF-NUST-35, resulting in a lower specific surface area. Based on the adsorption curve and the nonlocal density functional theory model (NLDFT), the pore-size distribution was calculated to be 2.56, 2.56 and 2.45 nm for COF-NUST-34, COF-NUST-35 and COF-NUST-36, which was identical to the simulated values. Thermogravimetric analysis (TGA) (Fig. S16 in Supporting information) indicated that the three COFs possessed excellent thermal stability and were thermally stable up to 400 ℃ under N2 atmosphere. The good chemical stability of COF-NUST-36 was evidenced by the retained PXRD patterns (Fig. S17 in Supporting information) after immersed in tetrahydrofuran, N,N-dimethylformamide, 1 mol/L HCl, 1 mol/L NaOH, and visible light irradiation at 25 ℃ for 24 h. Scanning electron microscopy (SEM) (Figs. S18-S20 in Supporting information) showed that the morphology of COF-NUST-34, COF-NUST-35, and COF-NUST-36 are both lamellar. High-resolution transmission electron microscopy (HRTEM) (Figs. 2g and h) evidenced the excellent crystallinity and indicated the spacing of the lattice fringe (~1.80 nm, ~2.00 nm) corresponded to the lattice planes of (200) for COF-NUST-34, COF-NUST-35, respectively. The spacing of the lattice fringe (~1.37 nm) (Fig. 2i) corresponded to the lattice planes of (220) for COF-NUST-36.
UV–vis diffuse reflectance spectroscopy (Fig. 3a) shows the broad absorption of COF-NUST in the visible region, which originating from the π-conjugated structure of COFs and the building blocks of excellent light absorption capacity (Fig. S21 in Supporting information). Notably, the trend of light absorption in the linkers (absorption region: EBSDC > BSDC > BTDC) is similar in COFs (absorption region: COF-NUST-36 > COF-NUST-35 > COF-NUST-34). By using the Kubelka-Munk function (αhv)2 = A(hv - Eg), where α is the absorption coefficient, h is the Planck constant, v is the frequency and A is the constant, the optical band gaps (Eg) of COF-NUST-34, 35 and 36 were determined to be 1.98, 1.90 and 1.80 eV, respectively (Fig. 3b). Obviously, the Eg of COF-NUST-36 is the narrowest, which is mainly due to the extended conjugation and the semimetal Se atoms with a lower ionization potential [50]. Mott–Schottky (M–S) (Fig. S22 in Supporting information) plot was used to estimate the conduction band value (ECB). The positive slops of MS plots indicated that the COF-NUST are n-type semiconductors. Typically, the ECB is equal to flat band potentials for n-type semiconductors. Accordingly, the ECB of COF-NUST-34, COF-NUST-35 and COF-NUST-36 are estimated to be −1.02, −1.08 and −1.11 V (vs. Ag/AgCl), respectively (Fig. 3c). According to the formula ECB = EVB - Eg, the valence band values (EVB) of COF-NUST-34, COF-NUST-35, and COF-NUST-36 are 0.96, 0.82 and 0.69 V (vs. Ag/AgCl), respectively. Theoretically the lowest occupied molecular orbital (LUMO) and the highest occupied molecular orbital (HOMO) levels of COF-NUST have sufficient potentials to reduce O2 to superoxide anion O2•– (Ered = −0.48 V vs. Ag/AgCl) [51] and oxidize benzylamine into a cation free radical (Eoxi = +0.56 V vs. Ag/AgCl) [52,53]. Hence, all COF-NUST can be latent photocatalyst for oxidative coupling of amines.
The molecular orbital diagrams of COF-NUST were obtained by density functional theory (DFT) calculation. The charge distributions of HOMO (Fig. 3d) and LUMO (Fig. S23 in Supporting information) in COF-NUST-34 are simultaneously located at BTDC and TAPP. The high levels overlap of HOMO and LUMO will lead to rapid recombination of charge carriers in COF-NUST-34. The charge distribution of HOMO in COF-NUST-35 (Fig. 3e) is only located at BSDC, while the charge of LUMO (Fig. S24 in Supporting information) is mainly distributed TAPP and BSDC. For COF-NUST-36, the charge distribution of HOMO (Fig. 3f) is only located at EBSDC, while the charge of LUMO (Fig. S25 in Supporting Information) is mainly distributed TAPP and EBSDC. Although partial overlap of HOMO and LUMO, electron-hole pairs can be separated effectively in COF-NUST-35 and 36. These results imply that COF-NUST-35 and 36 may have better photocatalytic performance.
To unveil the charge recombination and separation kinetics of COF-NUST, the temperature-dependent photoluminescence (TD-PL) (Figs. S26-S28 in Supporting information) spectra were measured. The value of Eb was estimated by fitting the integrated PL intensity with the temperature according to Arrhenius equation, I(T) = I0/(1 + Aexp(-Eb/kBT)) [54]. Accordingly, the Eb values for COF-NUST-34, COF-NUST-35 and COF-NUST-36 were estimated to be 89.9 meV, 55.1 meV and 39.5 meV (Figs. 3g-i), respectively. Notably, the Eb of COF-NUST-36 is significantly lower than COF-NUST-34 and COF-NUST-35, which means that excitons can be more easily dissociated into free carriers. It is worth noting that such low Eb (39.5 meV) is rare observed in COFs [27,44,45] or even inorganic materials such as MoS2, GaN and metal-halide perovskites (Table S4 in Supporting information) [29,46–48]. Meanwhile, these results indicate that the Eb can be reduced by single atom substitution and enlarging conjugation degree.
Since charge migration is directly related to Eb [55,56], we also systematically studied the charge mobility. As shown in room-temperature PL (Fig. 4a), COF-NUST-36 showed obvious PL quenching compared with COF-NUST-34 and COF-NUST-35, it indicated that the recombination of photogenerated carrier was suppressed. Time-resolved photoluminescence (TRPL) (Figs. S29-S32 in Supporting information) revealed the fluorescence lifetime of COF-NUST-36 (0.57 ns) is the shortest among the three materials (0.80 ns for COF-NUST-34, 0.75 ns for COF-NUST-35), suggesting that electron transport was accelerated in COF-NUST-36.
To further confirm the modulation of charge mobility in COF-NUST, we conducted a series of photoelectrochemical measurements. The transient photocurrent spectra indicated the photocurrent density (Fig. S33 in Supporting information) increases gradually from COF-NUST-34 to COF-NUST-36, implying that the Se atom and extended conjugation are conductive to the separation of charges. Electrochemical impedance spectroscopy (EIS) (Fig. 4b) also proves this result, the semicircular radius of COF-NUST-34 is the largest among three COFs, suggesting that the slowest charge transport [57]. Moreover, Linear sweep voltammetry (LSV) curves showed that the COF-NUST-36 has the highest cathodic photocurrent, whether under visible light illumination (Fig. 4c) or in the dark (Fig. S34 in Supporting information). Thus, we conclude that the lower of Eb can improve charge separation and mobility.
Imines, also known as Schiff bases, are widely used in various organic reactions, pharmaceutical intermediates, and fine chemicals. The traditional synthesis of imines often require acid as catalyst, which inevitably leads to waste of resources and environmental pollution. Photocatalytic selective oxidation provides a convenient and environmentally friendly method for the preparation of imines [58,59]. Accordingly, we used the oxidative coupling of amines to imines under blue light irradiation to evaluate the photocatalytic activity of these COFs. As shown in Table 1, entries 1–3, COF-NUST-36 clearly exhibited the highest conversion (97%) compared with COF-NUST-34 (40%) and COF-NUST-35 (82%) under optimal conditions. It can be accessible to the lowest Eb of COF-NUST-36, the excitons can effectively dissociate into charge carriers. Notably, with a prolonged reaction time (Table 1, entries 4 and 5), the conversion increased, while the selectivity decreased. So, the reaction time must be strictly controlled. We also conducted control experiments (Table 1, entries 6–8) to study the effects of catalyst, visible light irradiation and oxygen atmosphere on photocatalytic efficiency. With the absence of catalyst, the reaction will not take place. Without visible light irradiation or under N2 atmosphere, only trace product was obtained. Furthermore, air was used instead of oxygen (Table 1, entry 9), the reaction proceeded smoothly with a conversion of 84% realized in 2.5 h, which shows that COF-NUST-36 has high photocatalytic activity.
To explore the general applicability of the COF-NUST-36 photocatalysis for selective aerobic oxidation, benzylamine derivatives bearing different substituents were selected as substrates. All substrates can be transformed into the corresponding imines within 5 h (Scheme 1). In detail, the reaction of benzylamines bearing with electron-donating groups to afford marginally higher conversion and lower reaction time than benzylamines bearing with electron-withdrawing groups. For example, the 2d (–OCH3) can obtain a conversion of 97% in 2 h, however, the conversion of 2k is 94% in 4.5 h (-CF3), which is the electron-donating groups can better stabilize the cationic radical intermediate. Besides, the steric hindrance also has an obvious influence on the conversion. Such as piperonylamine (Scheme 1, 2l) or substituents in the adjacent position (Scheme 1, 2i) could slow down the reaction processed compared to benzylamine (Scheme 1, 2b). As a result, transforming into the corresponding imines with slightly prolonged time. Interestingly, The COF-NUST-36 also shows a high conversion (96%) for the oxidative coupling of heterocyclic amine (Scheme 1, 2a). At last, COF-NUST-36 shows high efficiency and general applicability in oxidation of benzylamine derivatives with difference size. This can be ascribed to the meso‑pores in COF-NUST-36.
The good durability of the COF-NUST-36 photocatalyst was confirmed by cycling experiment (Fig. S35 in Supporting Information). The photocatalytic efficiency of COF-NUST-36 can be well remained after being reused for three cycles. The crystallinity of COF-NUST-36 was essentially retained from the PXRD patterns and FTIR spectra after 3 runs, the lamellar morphology was also kept in SEM image.
To investigate the possible mechanism for the oxidative coupling of amines, we chose different scavengers to trap reactive oxygen species (ROS) (Fig. 4d). With the introduction of electron scavenger AgNO3 and hole scavenger KI, the conversion dramatically decreased to 16% and 41%, which indicated that the oxidative coupling of amines is associated with photogenerated electrons and holes. The superoxide radical anions (O2•–) scavenger benzoquinone (BQ) and singlet oxygen (1O2) scavenger 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) was added to photocatalysis system, a decrease in conversion was observed, illustrating that active species O2•– and 1O2 both play important roles in the reaction. Moreover, when the radical scavenger hydroquinone (HQ) was added, the conversion dropped to 70%, proved that the oxidation coupling involved a radical process. The addition of t-BuOH led to a slight decrease in conversion (95%), which implied that the hydroxyl radical (•OH) play a minor role in photocatalytic process.
Electron paramagnetic resonance (EPR) spectroscopy was conducted to confirm the presence of O2•– and 1O2. In general, 5,5-dimethyl-pyridine-N-oxide (DMPO) and TEMPO as sensitive trapping agent to selectively capture O2•– and 1O2. As shown in Figs. 4e and f, the EPR intensity of O2•– and 1O2 in COF-NUST-36 were detected under light irradiation. When the illumination time is prolonged, the EPR intensities of O2•– and 1O2 become stronger, which may be attributed to the accumulation of O2•– and 1O2. However, no EPR signal is observed in the dark. Hence, O2•– and 1O2 can be generated under light irradiation over COF-NUST-36.
Given the above experimental results and literature reports, a tentative reaction mechanism for the photocatalytic oxidation of benzylamine (BAN) over COF-NUST-36 was proposed (Fig. 5). This photocatalytic process is involved in both electron and energy transfer path. The ground state COF-NUST-36 is photoexcited to the excited state COF-NUST-36* (electron–hole pairs) under blue light irradiation, the electron can reduce O2 to generate O2•– in electron transfer path. At the same time, the BAN is oxidized to amine radical cation by COF-NUST-36+. O2•– immediate react with amine radical cation to generate hydroperoxy(phenyl)methanamine. The hydroperoxy(phenyl)methanamine is extremely unstable, which can convert into PhCH=NH with the removal of H2O2. The intermediate PhCH=NH and H2O2 also can be obtained by extracting hydrogen atoms from the substrate directly through 1O2 in an energy transfer path. The H2O2 can be dissociated into •OH under blue light irradiation, which is in favor for substrate to generate PhCH=NH. In the end, the PhCH=NH combine with BAN to obtain final product N-benzyl-1-phenylmethanimine. Furthermore, PhCH=NH is hydrolyzed to give benzaldehyde, which subsequently condensed with substrate to give the final product.
In summary, we proposed for the first time that the Eb of COF materials can be optimized by single atom substitution and extending conjugation strategy. A combination of temperature-dependent photoluminescence and electrochemical measurements reveals that the mesoporous COF-NUST-36 with less electronegativity of Se atoms and enhanced conjugation degree possesses the lowest Eb. The reduced Eb is helpful for the improvement of light capture and release of free charge carriers. Consequently, mesoporous COF-NUST-36 exhibited excellent photocatalytic performance for selective oxidation of amines under blue light. We believe that this work is not only benefit to understanding the relationship between exciton and photocatalytic activity at the atomic level, but also provides a new tactics for the design of advanced porous organic photocatalysts.
Declaration of competing interest
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The authors have no conflict of interest.
Acknowledgments
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This work was financially supported by the National Natural Science Foundation of China (No. 22171136), the Natural Science Foundation of Jiangsu Province (Nos. BK20220928, BK20220079), the Fundamental Research Funds for the Central Universities (Nos. 30921011102, 30922010902), the Medical Innovation and Development Project of Lanzhou University (No. lzuyxcx-2022-156), CAMS Innovation Fund for Medical Sciences (CIFMS, Nos. 2019-I2M-5-074, 2021-I2M-1-026, 2021-I2M-3–001), and the Startup Funding from Nanjing University of Science and Technology (Nos. AE89990, AE89991/376). G. Zhang acknowledges the support of the Thousand Young Talent Plan.
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doi: 10.1016/j.cclet.2023.108356
  • Receive Date：2023-01-31
  • Online Date：2025-11-20
  • Published：2024-02-15
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  • Received：2023-01-31
  • Revised：2023-02-19
  • Accepted：2023-03-20
Affiliations
    a Key Laboratory for Soft Chemistry and Functional Materials of Ministry of Education, School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
    b State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fuzhou 350002, China
    c MIIT Key Laboratory of Advanced Display Material and Devices, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
    d Key Laboratory of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences, Lanzhou University, Lanzhou 730000, China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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