Nanomaterials
·
2021
·Vol. 11
·期 12
·3192
·
IF 5.076
Hao Xu,Liangjing Zhang,Aiwu Wang,Juan Hou,Xuhong Guo
Photochromic materials have attracted increasing attention. Here, we report a novel photo-reversible color switching system based on oxygen-vacancy-engineered MoOxnanostructures with water/N-methyl-2-pyrrolidone (NMP) as solvents. In this work, the system rapidly changed from colorless to blue under UV irradiation (360–400 nm) and slowly recovered its colorless state under visible light irradiation. The obtained oxygen vacancy-engineered MoOxnanostructures exhibited good repeatability, chemical stability, and cycling stability. Upon UV light irradiation, H+was intercalated into layered MoOxnanostructures and the Mo6+concentration in the HxMoOxdecreased, while the Mo5+concentration increased and increased oxygen vacancies changed the color to blue. Then, it recovered its original color slowly without UV light irradiation. What is more, the system was highly sensitive to UV light even on cloudy days. Compared with other reported photochromic materials, the system in this study has the advantage of facile preparation and provides new insights for the development of photochromic materials without dyes.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
ChemPlusChem
·
2019
·Vol. 84
·期 4
·328-332
·
IF 3.441
Qiuhong Cheng,Yimeng Zhang,Tianxiang Luan,Zhuoer Wang,Ruipeng Tang,Pengyao Xing,Aiyou Hao
Graphical Surprisingly stable : Azobenzene derivatives bearing carboxylic acid units were investigated as hydrogelators. Upon deprotonation/protonation of the carboxylic acids, N -4-azodiphenyl-maleimic acid (ADPMA; see picture) could transform from solution to hydrogel. The ADPMA hydrogel shows typical trans-cis isomerization of the azobenzene unit in solution, yet the hydrogel demonstrates remarkable stability to UV light irradiation in both the bulk gel and thin film states. Azobenzene and its derivatives are widely used as photoresponsive units for the fabrication of photoresponsive smart materials. In this work, two azobenzene derivatives were designed and investigated as hydrogelators, namely N -4-azodiphenyl-maleimic acid (ADPMA) and N -4-azodiphenyl-succinic acid (ADPSA) bearing azobenzene and carboxylic acid segments. In the process of deprotonation/protonation of the carboxylic acids by pH variation, the self-assembly of these two gelators was triggered. ADPMA could transform from solution to hydrogel while the solution of ADPSA formed a precipitate under the same conditions. The solution-gel/precipitate transformation can be repeated by changing the pH. In contrast to the conventional responsiveness to UV-light irradiation for azobenzene-based gels, the ADPMA hydrogel shows typical trans - cis isomerization of the azobenzene unit in solution, yet the hydrogel demonstrates remarkable stability to UV light irradiation in both the bulk gel and thin film states.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
OPTICS AND LASER TECHNOLOGY
·
2024
·
IF 4.6
Aygul Kadir,Tursun Abdiryim,Xiong Liu,Fangfei Liu,Ruxangul Jamal,Xinsheng Tang,Yaolong Zhang
In the present work, a novel self-powered hybrid ultraviolet (UV) photodetector (PD) based on ZnO @ZnSe nanoarrays/poly(3,4-ethylenedioxyselenophene) (PEDOS) was fabricated and systematically investigated. The designed PD is based on a sandwich configuration and with p-n junction, which is consisting of ZnO as the bottom n- layer, PEDOS as the top of p-layer, and ZnSe as the insertion layer. The results of the study on the performances of UV PD under different conditions optical power density shows that the ZnO@ZnSe/PEDOS exhibits excellent detection of UV light, the device achieves the excellent responsivity (R) 5.44 mA/W and high detectivity (D*) 1.42 × 10 11 Jones under the weaker optical power density (0.32 mW/cm 2 ). The study concludes with a suggestion that the ZnSe layer acts a key role in the superior property of the obtained device, which is introduction of ZnSe layer between the p-PEDOS and n-ZnO layers reduces band migration and thus effectively enhances carrier transport within them, and demonstrating that the responsivity (R) of ZnO@ZnSe/PEDOS is almost 18 times that of the device without the ZnSe layer (0.3 mA/W). On the other hand, as the p- types PEDOS, which enhances the junction quality by reducing the composite center of the carrier, expanding the depletion region and providing a step energy level between the band edges of ZnO and ZnSe, improving the overall collection of photogenerated carriers.
研究领域:
材料科学
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光电子学
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半导体器件
✓ 已验证
产品关联
DOI
高影响因子
Soft Matter
·
2019
·Vol. 15
·期 21
·4346-4350
·
IF 3.399
Pan Sun,Kun Huang,Huizhou Liu
Understanding of the microcosmic essence of the competitive adsorption of different ions at liquid/liquid interfaces is of crucial importance for the elucidation of the unique chemical reactivities or selectivities of ions in numerous heterogeneous chemical processes. However, the knowledge of the microscopic mechanism behind the competitive adsorption of ions at the liquid/liquid interface is lacking. Herein, the competitive adsorption of various inorganic salt anions at organic-aqueous two-phase interfaces has been investigated as compared to that of the CrO42− ions by total internal reflection UV-visible (TIR-UV) spectroscopy since CrO42− ions are detectable by UV-visible spectroscopy and have a relatively poor interface propensity as compared to other chaotropic ions. Experimental results indicate that the interface propensities of different salt anions to the organic/aqueous phase interface follow the Hofmeister series. Molecular dynamics simulations further provided molecular-level evidence for role of the Hofmeister series of ions in the competitive adsorption of salt anions at organic-aqueous two-phase interfaces; the present study provided the first-hand experimental evidence demonstrating the occurrence of the Hofmeister series effect at the organic/aqueous two-phase interfaces, influencing the competitive adsorption of different salt ions; moreover, it is expected to offer a basis for the development of new strategies for the regulation of the chemical reactivity and selectivity of ions at organic/aqueous phase interfaces by introduction of other ions for competitive adsorption.
研究领域:
物理化学
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界面科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2017
·Vol. 32
·期 1
·e3966
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IF 2.319
Shuaishuai Ma,Qing Li,Zhilan Cai,Zhaolian Ye,Yuming Zhou
Novel ZnO/N-doped helical carbon nanotubes (ZnO/N-HCNTs) composites were successfully synthesized via a facile chemical precipitation approach at room temperature. The sample was well characterized by X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDS), transmission electron microscopy (TEM) and ultraviolet–visible diffuse reflectance spectroscopy (UV–vis DRS). The photocatalytic activity was evaluated in the degradation of methylene blue (MB) aqueous solution under UV light irradiation. It is found that ZnO nanoparticles were highly and uniformly anchored on the surface and inner tubes of the N-HCNTs with size of about 5 nm, and significantly enhanced the photocatalytic activity compared to pure ZnO. The enhanced photocatalytic activity of ZnO/N-HCNTs composites can be ascribed to the integrative synergistic effect of effective interfacial hybridization between N-HCNTs and ZnO nanoparticles and the prolonged lifetime of photogenerated electron–hole pairs. Moreover, the ZnO/N-HCNTs could be easily recycled without any obvious decrease in photocatalytic activity and could be promote their application in the area of environmental remediation.
研究领域:
材料科学
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环境科学
✓ 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）