Crystals
·
2021
·Vol. 11
·期 5
·547
·
IF 2.589
Zengguang Tang,Liujiang Zhang,Zhenhuang Su,Zhen Wang,Li Chen,Chenyue Wang,Guoping Xiao,Xingyu Gao
In this article, CsPbI2Br perovskite thin films were spin-coated on FTO, on which CuPc was deposited by thermal evaporation. The electronic structure at the CsPbI2Br/CuPc interface was examined during the CuPc deposition by in situ X-ray photoelectron spectroscopy (XPS) and ultraviolet photoelectron spectroscopy (UPS) measurements. No downward band bending was resolved at the CsPbI2Br side, whereas there is ~0.23 eV upward band bending as well as a dipole of ~0.08 eV identified at the molecular side. Although the hole injection barrier as indicated by the energy gap from CsPbI2Br valance band maximum (VBM) to CuPc highest occupied molecular orbital (HOMO) was estimated to be ~0.26 eV, favoring hole extraction from CsPbI2Br to CuPc, the electron blocking barrier of ~0.04 eV as indicated by the offset between CsPbI2Br conduction band minimum (CBM) and CuPc lowest unoccupied molecular orbital (LUMO) is too small to efficiently block electron transfer. Therefore, the present experimental study implies that CuPc may not be a promising hole transport material for high-performance solar cells using CsPbI2Br as active layer.
研究领域:
材料科学
·
光伏器件
·
表面科学
✓ 已验证
DOI
高影响因子
Molecular Catalysis
·
2024
·
IF 3.9
Rui Sun,Hongtao Li,Yudan Zhang,Junyi Hua,Wenxin Xu,Kexin Li,Huiqin Guo,Liushui Yan,Shenglian Luo
In this paper, BiOBr@H 3 PW 12 O 40 @BiOI heterostructure with honeycomb-like morphology is successfully constructed for the first time by a simple one-step solvothermal strategy. The introduction of H 3 PW 12 O 40 effectively improves the specific surface area and photon trapping ability of BiOBr@BiOI heterostructure. More importantly, the W 5d electron orbital of H 3 PW 12 O 40 , as an electron bridge, effectively improves the transmission efficiency of photogenerated electrons in the BiOBr@BiOI heterostructure, thus making the BiOBr@H 3 PW 12 O 40 @BiOI heterostructure show excellent performance in the photocatalytic oxidation or reduction reaction. Based on the macro-thermodynamic model proposed in our previous work and the active species capture experiments, the photocatalytic oxidation or reduction mechanism by using as-prepared BiOBr@H 3 PW 12 O 40 @BiOI heterostructure is discussed in detail.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Ying Wang,Zaiwen Lin,Yan Song,Haotian Wu,Jing Yu,Jiahui Zhu,Qi Liu,Ying Li,Shusen Chen,Jun Wang
Commencing with the goal of establishing a more stable coordination structure for uranium, our approach drew inspiration from the alternating single and double bonds found in benzene rings and amidoxime groups. A uranium adsorption material featuring a π-electron conjugated system is devised. This system is designed by grafting 2-cyanobenzaldehyde, 3-cyanobenzaldehyde, and 4-cyanobenzaldehyde onto bamboo strips (BS) via aldol condensation and hydrolysis reactions, resulting in the creation of 2-amidoxime phenyl BS (oBS-AO), 3-amidoxime phenyl BS (mBS-AO), and 4-amidoxime phenyl BS (pBS-AO). Among these, oBS-AO exhibits not only the highest uranium adsorption performance (224.6 mg g −1 at pH = 6 and 1.3 mg g −1 in artificial simulated seawater) but also features the most robust π-electron conjugated system, as confirmed by computational and simulation data. Notably, the uranium adsorption capacity of mBS-AO is approximately 46.7 times that of vanadium in ion competition experiments simulating seawater conditions. To delve further into the adsorption mechanism, the role of electrostatic interactions and optimized simulated coordination structures is explored. It becomes evident that the primary adsorption mechanism relies on the formation of a pentacoordination structure, and the stability of this coordination structure iss directly influenced by the strength of the π-electron conjugated system. Furthermore, the double bridging effect of hydrogen bonds serves to further stabilize the coordination structure, facilitating the specific and selective adsorption of uranium.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
·
2024
·
IF 6
Xiuhong Zhao,Yuxia Yang,Jinxi Cui,Yuxin Gan,Qingyu Yang
The effect of individually mixing Lactobacillus paracasei C5 and Lactobacillus pentosus D1 with yeast as starter cultures on bread flavor was investigated via electronic-nose, electronic-tongue, and GC × GC-ToF-MS methods The electronic-nose results showed that the bread smell could be completely distinguished. Electronic-tongue analysis revealed that the taste of mixed-fermented bread was positively correlated with sourness, sweetness, saltiness, and umami, while the taste of yeast-fermented bread was positively correlated with bitterness and astringency. GC × GC-TOF-MS was used to further detect volatile organic compounds, from which 15 ( L. paracasei bread) and 18 ( L. pentosus bread) major contributing aroma compounds were screened (ROAV ≥1 and VIP >1). Additionally, Lactobacillus was found to be positively correlated with 35 flavor substances and positively regulated the aroma profile of the bread, especially sweet-caramel, coffee-like, and roasted aromas. In conclusion, LAB involved in fermentation can improve the flavor of bread.
研究领域:
食品科学
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS
·
2020
·Vol. 20
·期 4
·1065
·
IF 3.275
Huihui Zhang,Wenqing Shao,Shanshan Qiu,Jun Wang,Zhenbo Wei
Aroma and taste are the most important attributes of alcoholic beverages. In the study, the self-developed electronic tongue (e-tongue) and electronic nose (e-nose) were used for evaluating the marked ages of rice wines. Six types of feature data sets (e-tongue data set, e-nose data set, direct-fusion data set, weighted-fusion data set, optimized direct-fusion data set, and optimized weighted-fusion data set) were used for identifying rice wines with different wine ages. Pearson coefficient analysis and variance inflation factor (VIF) analysis were used to optimize the fusion matrixes by removing the multicollinear information. Two types of discrimination methods (principal component analysis (PCA) and locality preserving projections (LPP)) were used for classifying rice wines, and LPP performed better than PCA in the discrimination work. The best result was obtained by LPP based on the weighted-fusion data set, and all the samples could be classified clearly in the LPP plot. Therefore, the weighted-fusion data were used as independent variables of partial least squares regression, extreme learning machine, and support vector machines (LIBSVM) for evaluating wine ages, respectively. All the methods performed well with good prediction results, and LIBSVM presented the best correlation coefficient (R2≥ 0.9998).Keywords:e-tongue;e-nose;rice wine;modified electrodes;smartphone
研究领域:
食品科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2013
·Vol. 3
·期 33
·13782-13788
·
IF 2.562
Zhongfu An,Qingyang Wu,Jianjian Xiao,Runfeng Chen,Jun Yin,Huifang Shi,Ye Tao,Yang Wang,Zhixiang Wang,Huanhuan Li,Hongmei Zhang,Xinhui Zhou,Yi Zhao,Wei Huang
A series of ternary asymmetric triazines with tunable singlet and triplet excited states were successfully synthesized on the basis of σ-spacer methodology and a facile synthetic route. The optoelectronic properties are dominated by the conjugated donor–acceptor (D–A) backbone of peripheral carbazoles (D) and triazine core (A), and can be further modulated via the partially interrupted conjugation between the core and the third substituents by the σ spacers of N–CH3, NH, O, S and OSO, which offers new opportunities to fine tune the electronic structures and properties of triazines.
研究领域:
有机化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2023
·Vol. 13
·期 6
·1830-1845
·
IF 5
Hong Wang,Zhongming Wang,Mingquan Xiao,Zizhong Zhang,Xianzhi Fu,Wenxin Dai
Improving product selectivity is the most important goal for the artificial photosynthesis of CO2 and H2O considering that the adsorption behaviors of reactants may play an important role in the product selectivity of CO2 conversion. In this work, a black In2O3 sample was modified with fluoride anions (F−) as electron donors or amino ions (NH2+) as electron acceptors. F-modified In2O3 provided additional F− and In2+ sites, which promoted H2O to accept more electrons from the material, and exhibited a high selectivity to CH4 of 81.95%. NH2-modified In2O3 caused H2O to donate electrons to the material by constructing a hydrophobic layer, resulting in a high combined selectivity to methanol and carbon monoxide of 87.64%. Based on the two different H2O adsorption behaviors at In2+ sites adjacent to oxygen vacancy defects (VO–In2+) or at In3+ sites, the respective formation of hydrogen ions (H+) or protons (*H) is key to regulating the product selectivity of CO2 reduction. The formation of a confined-space structure of CO2 and its capacity to accept more electrons from the material induced by a higher number of VO–In2+ sites after modification both ensure the proceeding of CO2 reduction. The findings presented in this work add to the understanding of artificial photosynthesis.
研究领域:
材料科学
·
催化化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Yun Mou,Yuru Zhang,Hao Cheng,Yang Peng,Mingxiang Chen
To solve the problems of high sintering temperatures (∼200 °C), particle aggregation, nozzle clogging, and poor shelf life of silver nanoparticle inks, we prepared a transparent and stable reactive silver ink for fabricating printed electronics. The ink mainly consisted of ammonia and formic acid ligands, silver acetate, and hydroxyethyl cellulose (HEC) adhesive agent. The highly conductive and flexible silver films were fabricated by printing and low temperature sintering the reactive silver ink, and the effects of sintering temperature and sintering time on the electrical properties of the printed silver films were investigated. Consequently, the printed silver film sintered at 70 °C exhibits good electrical properties with a resistivity of 12.1 μΩ·cm, which is only seven times higher than that of bulk silver (1.65 μΩ·cm). Moreover, the silver film also displays excellent adhesive strength and mechanical flexibility in terms of bending and twisting.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
WATER AIR AND SOIL POLLUTION
·
2022
·Vol. 233
·期 12
·1-14
·
IF 2.984
Li Weiquan,Li Mingxi,Yin Weizhao,Zhang Weinan,Zhong Jiawei,Li Ping,Deng Hong,Wu Jinhua
The removal of Cr(VI) from groundwater by zero-valent iron (Fe 0 ) and microorganisms under different nutrients and electron-accepting conditions was investigated using continuously-flowed column reactors with an abiotic Fe 0 column as the control. Both abiotic and biotic Fe 0 columns were operated at low and relatively high concentrations of organic substrates (sodium acetate and humic acid) and electron acceptors (nitrate and sulfate). Sodium acetate and humic acid were found to be effective substrates for the biotic Fe 0 system to remove Cr(VI) since microorganisms were able to gain extra reducing capacity from two nutrients and simultaneously avoid the passivation effect of humic acid on Fe 0 by metabolizing it. For nitrate and sulfate, varied influences were observed in the biotic Fe 0 system. The former showed apparent inhibition on Cr(VI) removal as it competed with Cr(VI) for electrons, and the inhibition became more severe while nitrate concentrations increased. Differently, highly reactive minerals such as green rusts and iron sulfide could be generated on the biotic Fe 0 surface under sulfate-reducing condition. They significantly enhanced Cr(VI) removal by providing more adsorptive and reductive sites. Overall, though the biotic Fe 0 column exhibited a longer life-span and higher Cr(VI) removal capacity than the abiotic Fe 0 column, the effects of organic substrates and electron acceptors should still be taken into account when applying biotic Fe 0 systems for Cr(VI)-contaminated groundwater remediation.
研究领域:
环境科学
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2019
·Vol. 10
·期 1
·1-11
·
IF 11.878
Gao Naiwei,He Yonglin,Tao Xinglei,Xu Xiao-Qi,Wu Xun,Wang Yapei
Liquid sensors composed of ionic liquids are rising as alternatives to solid semiconductors for flexible and self-healing electronics. However, the fluidic nature may give rise to leakage problems in cases of accidental damages. Here, we proposed a liquid sensor based on a binary ionic liquid system, in which a flowing ionic liquid [OMIm]PF 6 is confined by another azobenzene-containing ionic liquid crystalline [OMIm]AzoO. Those crystal components provide sufficient pinning capillary force to immobilize fluidic components, leading to a freestanding liquid-like product without the possibility of leakage. In addition to owning ultra-high temperature sensitivity, crystal-confined ionic liquids also combine the performances of both liquid and solid so that it can be stretched, bent, self-healed, and remolded. With respect to the reconfigurable property, this particular class of ionic liquids is exploited as dynamic circuits which can be spatially reorganized or automatically repaired.
研究领域:
材料科学
·
电子工程
·
纳米技术
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Zhuang Wang,Xiaoyun Xu,Ke Zhang,Renjie Tan,Shuai Zhang,Yupei Su,Jinlian Hu
Conductive hydrogel fibers exhibit great potential in soft robots, bioelectronics, and human–machine interfaces due to the unique combination of electrical conductivity, high water content, tissue-like mechanical properties, and 1D structure. Despite significant advances in hydrogel technologies, the typical conductive hydrogel fibers show low conductivity (<10 S cm −1 ), weak mechanical properties, and water stability, which makes it challenging to satisfy the requirements of practical applications. Here, a facile strategy is proposed to construct hydrogel fibers with ultrahigh conductivity and toughness by exploiting the synergistic effects of freezing-thawing, salting-out, and drying-annealing. The continuous phase separation induced by the combined processes results in hierarchical structures, promoting the formation of interconnected conductive networks and increasing the fiber's crystallinity and crystal domain size. The prepared conductive hydrogel fibers exhibited ultrahigh conductivity (≈958 S cm −1 ), excellent mechanical properties (strength (≈6.2 MPa), stretchability (>300%), and toughness (≈10 MJ m −2 )), high water content (≈75%), outstanding water stability, and fatigue resistance properties. In addition, the processibility of conductive hydrogel yarns and fabrics are demonstrated and their potential application in bioelectronics. Overall, this work presents a preparation strategy for conductive hydrogel fibers, which will facilitate the advancement of soft electronics and may inspire structural construction in other polymers.
研究领域:
材料科学
·
生物医学工程
·
软机器人技术
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2021
·Vol. 11
·期 4
·1021
·
IF 5.076
Hui Zhang,Tao Xu,Yatong Zhu,Wen Wang,Hao Zhang,Dundong Yuan,Litao Sun
Understanding the mechanism of metal oxidation processes is critical for maintaining the desired properties of metals and catalysts, as well as for designing advanced materials. In this work, we investigate the electron beam induced oxidation of silver using in situ transmission electron microscopy. The additions of Ag-O columns on {111} and {110} planes were captured with atomic resolution. Interestingly, oscillatory growth on {110} planes was observed, which resulted from the double effect of electron beam irradiation. It was found that not only thermodynamic factors but also kinetic factors played significant roles in morphology evolutions. These results can facilitate the fundamental understanding of the oxidation process of Ag and provide a promising approach for the fabrication of desired nanostructures.Keywords:oxidation;crystal growth;electron beam irradiation;in situ;transmission electron microscopy
研究领域:
材料科学
·
物理化学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）