ORGANIC ELECTRONICS
·
2024
·
IF 2.7
Cangyu Wang,Xiaoge Song,Sinyeong Jung,Wansi Li,Maggie Ng,Season Si Chen,Man-Chung Tang
Recent research on anthracene-based hydrocarbon (PNA) as the emissive layer host found that deuteration mediated the formation of these adduct species, presumably quenchers, and thus improved the device lifetime. Meanwhile, studies on deuterium in PNA host materials with stepwise deuteration are scarce. In this work, we report a systematic study of isotopic effects through independent deuteration of the phenyl or/and the dibenzofuran unit on a series of PNA materials polyaromatic dibenzofuran ( PAF , PAF- d 5 , PAF- d 7 and PAF- d 12 ). We fabricated fluorescent OLED based on this triplet-triplet up-conversion active host materials for conventional MR-TADF emitter. A short-lived excited delayed lifetime of less than 2 μs has been observed in their electroluminescence decay studies. In addition, LT 80 of up to 12.7 h has been observed in PAF- d 12 at the brightness of 1000 cd m −2 , corresponding to a 4-fold enhancement of OLED stability compared to the non-deuterated counterpart. We hope the current research can provide insights for further device improvement.
研究领域:
材料科学
·
有机电子学
✓ 已验证
产品关联
DOI
高影响因子
Nuclear Science and Techniques
·
2025
·Vol. 36
·期 10
·1-15
·
IF 3.8
Tian Jun-Lei,Feng Jia-Xing,Shen Jia-Cong,Yao Lei,Wang Jing-Yan,Wu Tao,Zhao Yao-Lin
Missing values in radionuclide diffusion datasets can undermine the predictive accuracy and robustness of the machine learning (ML) models. In this study, regression-based missing data imputation method using a light gradient boosting machine (LGBM) algorithm was employed to impute more than 60% of the missing data, establishing a radionuclide diffusion dataset containing 16 input features and 813 instances. The effective diffusion coefficient ( D e ) was predicted using ten ML models. The predictive accuracy of the ensemble meta-models, namely LGBM-extreme gradient boosting (XGB) and LGBM-categorical boosting (CatB), surpassed that of the other ML models, with R 2 values of 0.94. The models were applied to predict the D e values of EuEDTA − and HCrO 4 − in saturated compacted bentonites at compactions ranging from 1200 to 1800 kg/m 3 , which were measured using a through-diffusion method. The generalization ability of the LGBM-XGB model surpassed that of LGB-CatB in predicting the D e of HCrO 4 − . Shapley additive explanations identified total porosity as the most significant influencing factor. Additionally, the partial dependence plot analysis technique yielded clearer results in the univariate correlation analysis. This study provides a regression imputation technique to refine radionuclide diffusion datasets, offering deeper insights into analyzing the diffusion mechanism of radionuclides and supporting the safety assessment of the geological disposal of high-level radioactive waste.
研究领域:
核科学与技术
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环境科学
·
机器学习
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放射化学
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地质处置
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数据挖掘
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS & DESIGN
·
2019
·
IF 5.77
Yi-lei Li,Ying Liu,Ying-juan Hao,Xiao-jing Wang,Rui-hong Liu,Fa-tang Li
Core-shell heterostructured BiVO 4 @Fe 2 O 3 photocatalysts are fabricated through a facile solution combustion and in-situ precipitation methods. Transmission electron microscopy (TEM) and high-resolution TEM (HRTEM) images verify their core-shell structure. X-ray photoelectron spectroscopy (XPS) results indicate there are interaction between BiVO 4 and Fe 2 O 3 , confirming the formation of heterojunction. Mott–Schottky measurements exhibit that hybridizing with Fe 2 O 3 makes the conduction band of BiVO 4 to be shifted up by 1.05 V from 0.21 to −0.84 V, which endows BiVO 4 to be effective for photocatalytic H 2 generation. Meanwhile, photoluminescence spectra show that the heterosturcture decreases the recombination efficiency of photo-induced electrons and holes. Hydrogen experiments indicate that BiVO 4 @Fe 2 O 3 composite containing 10 wt% Fe 2 O 3 has the highest catalytic activity.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
PHYSICA SCRIPTA
·
2025
·Vol. 100
·期 3
·035954
·
IF 2.6
Lairong Yan,Penghui Ren,Jianping Yang,Zhenxuan Ding,Hao Hu,Guoqiang Zhang,Yanbin Zhang,Ping Lin,Lingbo Xu,Peng Wang,Can Cui
Perovskite-based semiconductor photodetectors have attracted wide attention in the photoelectric fields. By local MoO3 induction, MoO3:CsPbBr3−CsPbBr3 homojunction photodetector was constructed by chemical vapor deposition, exhibiting not only excellent response speed in the scale of microsecond, but also high responsivity of 247.1 A W−1 and detectivity (8.7 × 1012 Jones), roughly an order of magnitude higher than that of CsPbBr3 devices. Ultraviolet photoelectron spectroscopy measurements show that the Fermi level moves closer to the top of the valence band due to the local MoO3 induction, leading to the conversion of weak p-type CsPbBr3 to a strong p-type semiconductor, which is consistent with the calculation result based on density functional theory (DFT). The band alignment in the homojunction accelerates the photo-generated carrier separation and transfer, thus improving the photoelectric performance of MoO3:CsPbBr3−CsPbBr3 homojunction. Our results provide a new strategy to design photodetectors with excellent performance by constructing homojunctions with perovskite on different substrates.
研究领域:
材料科学
·
光电子学
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2022
·Vol. 27
·期 22
·7998
·
IF 4.927
Hui Zhang,Huahui Zeng,Mengfei Li,Yagang Song,Shuo Tian,Jing Xiong,Lan He,Yang Liu,Xiangxiang Wu
A series of co-crystals of ascorbic acid were prepared with equimolar amounts of co-crystal formers (CCFs), including isonicotinic acid, nicotinic acid, 3,4-dihydroxybenzoic acid, 2,5-dihydroxybenzoic acid and m-hydroxybenzoic acid, by slow solvent evaporation and solvent-assisted grinding. The co-crystals were characterized by single-crystal X-ray diffraction spectroscopy, powder X-ray diffraction, IR spectroscopy, differential scanning calorimetry and thermogravimetric analysis. Molecular dynamics (MD) simulations further validated the interaction energy and the possible intermolecular hydrogen bonds among VC and CCFs. The co-crystals showed improved stability when exposed to different wavelengths of light, pH and temperatures compared to the free analogue, especially at higher pH (~9) and lower temperature (~4 °C).Keywords:co-crystals;ascorbic acid;improved stability;hydrogen bonding
研究领域:
药物化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Tingfeng Ma,Bin Li,Shouqin Tian,Jiachen Qian,Longxiao Zhou,Qiufen Liu,Baoshun Liu,Xiujian Zhao,Gopinathan Sankar
W 18 O 49 has widely used in photothermal application and photocatalyst due to its strong Localized Surface Plasmon Resonance (LSPR) effect and unique oxygen-deficient structure. In addition, the unstable structure and easily changed valence state of W 5+ make W 18 O 49 potentially photochromic. However, the generally synthesized blue W 18 O 49 particles was in a saturated colored state, delivering a great challenge in exploring its photochromic features, which thus have seldom been studied. Herein, we found that the bleached W 18 O 49 obtained by mild-heating the solvothermal-synthesized blue W 18 O 49 nanoparticles in air had considerable reversible photochromic feature, which can be colored in 1 min under UV irradiation. The photochromic mechanism of W 18 O 49 was revealed through the XRD, XPS and FTIR results. The chromic process was mainly attributed to the changed W 5+ content under different conditions. The photochromic performance was systematically investigated on the W 18 O 49 -based film and which can be significantly improved by Ti doping. Finally, the great potential of the films in the energy-saving smart windows application has verified, and a 10 at.% Ti-doped W 18 O 49 film delivered outstanding optical performance with luminous transmittance ( T lum ) of 87.53% and solar energy modulation efficiency (Δ T sol ) of 30.13%.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS
·
2024
·Vol. 24
·期 13
·4142
·
IF 3.4
Ling Zhang,Chu Chen,Hongyan Zhang
TiO2is a typical semiconductor material, and it has attracted much attention in the field of humidity sensors. Doping is an efficient way to enhance the humidity response of TiO2. Eu-doped TiO2material was investigated in both theoretical simulations and experiments. In a simulation based on density functional theory, a doped Eu atom can increase the performance of humidity sensors by producing more oxygen vacancies than undoped TiO2. In these experiments, Eu-doped TiO2nanorods were prepared by hydrothermal synthesis, and the results also confirm the theoretical prediction. When the doping mole ratio is 5 mol%, the response of the humidity sensor reaches 23,997.0, the wet hysteresis is 2.3% and the response/recovery time is 3/13.1 s. This study not only improves the basis for preparation of high-performance TiO2humidity sensors, but also fills the research gap on rare earth Eu-doped TiO2as a humidity-sensitive material.
研究领域:
材料科学
·
半导体技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Yaowei Wei,Ke Zhou,Xianghuan Meng,Xiangyu Sun,Zhao Ma,Zhenzhen Li,Daming Zhuang
Due to the low toxicity and abundance of nature, Cu 2 ZnSn(S,Se) 4 (CZTSSe) has been considered as a promising solar cell material. The absorber is the most critical structure in a solar cell, which determines the performance of the cell. Selenium-rich CZTSSe can be formed by replacing S atoms of CZTS with Se. However, the method of adding Se element through H 2 Se is constrained due to the toxicity of H 2 Se. The work adopted a method to prepare excellent CZTSSe absorbers without H 2 Se. The stack structure CZTS precursor films were prepared by solution-based deposition, and CZTSSe absorbers were obtained after selenization annealing at 550 °C with 0.1, 0.2 and 0.3 g of selenium powders in argon, respectively. The obtained CZTSSe absorbers had pure CZTSSe phase, high absorption coefficients and appropriate bandgaps. After annealing with 0.2 g of selenium powder, the holes in the CZTSSe film diminished, and the grain size of absorbers increased from 0.31 µm in the CZTS absorber to 1.17 µm. The peaks of Se 3d for CZTSSe absorber were observed, the lattice spacing of plane (112) increased from 3.10 Å to 3.22 Å, and the work function decreased from 5.31 eV to 5.19 eV. The improved performance of absorber will be of great significance for the efficiency of CZTSSe device.
研究领域:
材料科学
·
太阳能电池研究
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产品关联
DOI
高影响因子
Nano Energy
·
2016
·
IF 11.553
Lin Fan,Yi Ding,Biao Shi,Changchun Wei,Dekun Zhang,Jiangsheng Xie,Xuegong Yu,Baojie Yan,Ying Zhao,Xiaodan Zhang
A thin PC 61 BM buffer layer (BL) has been introduced between TiO 2 electron transporting layer and perovskite absorber in n-i-p planar perovskite solar cells (PSCs). We have found that the elastic nature of the PC 61 BM BL promotes the formation of porous PbI 2−x Cl x thin film with loose structure, which is vital in the following formation of high quality, uniform perovskite films with large grain size. In addition, it has been demonstrated that the thin PC 61 BM BL also flattens the TiO 2 surface, passivates the defects or dangling bands parasitizing on the TiO 2 surface, and optimizes the device band alignment. As a result, the device efficiency has been enhanced dramatically from ~8.37% to 15.44%. Moreover, devices show a good stability over 400 h and reproducibility in 20 pieces fabricated with the same procedure, which implies that this finding is benefit for fabricating highly efficient PSCs. We introduced a thin PC 61 BM buffer layer between the TiO 2 electron transport layer and the perovskite absorber in n-i-p planar perovskite solar cells , which facilitates the construction of a porous PbI 2−x Cl x precursor film, and thus promotes the following realization of high quality, uniform perovskite films with large grain size and improves the solar cell efficiency significantly.
研究领域:
材料科学
·
能源技术
·
光伏器件
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Boyu Zhao,Zezhou Zhang,Wenyi Wang,Xiangdong Yang,Chennan Zhao,Xiuying Yang,Ao Shen,Meiqi Ye
A structurally stable AgCl-COOH MWCNT/PES composite membrane was designed and fabricated by combining phase conversion and post-treatment techniques, which can solve the serious membrane fouling in industrial wastewater treatment. The carboxylation of MWCNTs not only enhanced their dispersion but also facilitated their binding with silver chloride, resulting in a stable composite structure that significantly improved contaminant degradation capabilities. The post-treatment technique increased the membrane’s water purification flux by 150 % (reaching 520 L·m 2 ·h −1 ·bar −1 ) while maintaining a high BSA retention rate of 95 %. Additionally, the composite membrane demonstrated excellent photocatalytic antifouling properties, with a flux recovery rate of 91.8 % under UV irradiation, and exhibited more than 99 % inhibition of Escherichia coli. This method provides a scalable solution for enhancing the performance of PES membranes in wastewater treatment applications.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CANADIAN GEOTECHNICAL JOURNAL
·
2024
·
IF 3
Xingxing He,Yong Wan,Yijun Chen,Xun Tan,Shiquan Wang,Xiaoli Liu,Qiang Xue
Soil organic matter (SOM) has always been one of the critical factors affecting the solidification of dredged soil. This study proposes a solidification/oxidization synergistic method for treating high organic dredged soil (DS). Three solid oxidants, i.e., sodium persulfate (PS), sodium percarbonate (PC), and potassium ferrate (PF), were added to DS in cooperation with cement, respectively. The results show that all three oxidants showed a good degradation effect on SOM and had the optimal dosage, which increased gradually with cement content (Ac) when used with cement. Under the optimal dosage of oxidant and Ac = 15%, PS and PC can improve the unconfined compression strength (UCS) of cemented DS (CDS) at 60 days of curing to nearly 4 times compared with that without oxidant, while PF can only increase the 60d-UCS to 1.5 times. In addition, the influence mechanism of different oxidants on the UCS of CDS was analyzed based on microscopic tests, proving that the three oxidants can not only degrade the SOM in CDS but also participate in the hydration reaction of cement. It is feasible to use proper amounts of PC and PS in combination with cement to solidify high organic soil.
研究领域:
环境工程
·
土木工程
✓ 已验证
DOI
高影响因子
VACUUM
·
2022
·
IF 4.11
Jingyun Chun,Xiaolong Wang,Yuchan Zhang,Chuanliang Wei,Zhengran Wang,Jinkui Feng
Sodium-ion batteries (SIBs) are ideal technologies for large-scale energy storage systems because of their abundant resources and low cost. However, Al foil, the current collector of sodium-ion battery, has a great influence on the performance of the battery, but it has rarely been studied. In this paper, we prove that the Ti 3 C 2 T x MXene current collector can make a stronger connection with the electrode, lowering the electrode-collector interface resistance considerably. When compared to Al current collectors in SIBs, the Ti 3 C 2 T x MXene current collector reduces polarization and enhances performance. the sodium vanadium phosphate(NVP) electrode with Ti 3 C 2 T x MXene current collector exhibits significantly enhanced rate capability (81.9 mAh g −1 at 500 mA g −1 ) and cycling performance (81.5% over 200 cycles at 1C) than Al foil. The results show that Ti 3 C 2 T x MXene current collector has a broad prospect in the application of high power SIB battery.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）