JOURNAL OF ALLOYS AND COMPOUNDS
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2023
·
IF 6.2
Yufang Li,Yangchun Feng,Hang Bai,Jinsong Liu,Dayuan Hu,Jiyu Fan,Honglie Shen
In recent years, large and small industries have discharged a multitude of organic pollutants into the environment, causing environmental pollution. Titanium dioxide (TiO 2 ) materials is very important photocatalyst as a result of its outstanding applications to remove organic contaminants from the environment. Nonetheless, the low utilization rate of visible light of TiO 2 has limited its application. To begin with, Black TiO 2 is produced by the magnesium thermal reduction method to promote the absorption of visible light, Subsequently, The black TiO 2 /SnO 2 composites are synthesized by chemical synthesis method to form a hetero-junction to augment the photocatalytic activity. The morphology, chemical composition, phase structure and photocatalytic degradation of Rhodamine B (RhB) under visible light irradiation were investigated. The morphological properties demonstrated that a Ti 3+ self-doped disorder layer forms on the surface of TiO 2 nanophase, and black TiO 2 nanoparticles are well decorated with SnO 2 nanoparticles. After 90 min of visible light irradiation, RhB has a photocatalytic degradation efficiency of 96.62%, which is 1.597 times that of TiO 2 nanoparticles, and its cycle stability is well beyond our expectation. The ameliorated photocatalytic degradation performance of TiO 2 /SnO 2 composite is ascribed to the formation of a "type Ⅱ heterojunction", which not only reinforces the absorption of visible light of black TiO 2 /SnO 2 nanoparticles, but also heightens the separation and transfer efficiency of the photogenerated carriers.
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ANALYTICAL CHEMISTRY
·
2023
·
IF 7.4
Cui Wang,Mengli Zhang,Lipeng Bai,Panpan Gai,Feng Li
The peroxidase (POD)-like nanozyme typically requires the addition of exogenous H2O2. To address the limitation, previous work mainly adopted a cascade strategy for H2O2 production. Herein, we propose a new light-driven self-cascade strategy to construct POD-like nanozymes without exogenous H2O2. The model nanozyme resorcinol–formaldehyde resin-Fe3+ (RF-Fe3+) is synthesized with the hydroxyl-rich photocatalytic material RF as the carrier to in situ chelate metal oxides, which can simultaneously achieve the functions of in situ H2O2 generation under irradiation and substrate oxidation via POD-like behavior. Notably, RF-Fe3+ exhibits high affinity to H2O2, attributed to the excellent adsorption ability and hydroxyl-rich feature of RF. Furthermore, the dual photoelectrode-assisted photofuel cell was further constructed with a high-power density of 120 ± 5 μW cm–2 based on the RF-Fe3+ photocathode. This work not only demonstrates the new self-cascade strategy of in situ generation of catalysis substrates but also provides an opportunity to extend the catalytical field.
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ACS Photonics
·
2023
·
IF 7
Panpan Hao,Wei Jiang,Mengjie Li,Mufang Li,Qiongzhen Liu,Liyan Yang,Yan Tan,Yuedan Wang,Dong Wang
A novel flexible photodetector using yarn-based phototransistors is reported for the first-time. Reduced graphene oxide (rGO) doped with poly(3,4-ethylenedioxythiophene)/poly(styrenesulfonate) (PEDOT:PSS) was prepared by simple solution processing and coated by tungsten disulfide quantum dots (WS2 QDs) for novel yarn-based phototransistors (YPTs). The transistor-based photodetector exhibits good p-type transistor behavior and high transconductance (4.7 mS). The YPTs with an rGO-PEDOT:PSS/WS2 QDs heterojunction as the photosensitive layer are regulated by different light wavelength, light power, and gate voltage with UV–visible light. It is observed that the highest photoresponsivity of the device (Rmax) is 4.42 × 102 A/W under 365 nm UV light, the maximum specific detectivity (D*max) is 2.86 × 1011 Jones, and the fast response and recovery times are 1.78 and 2.91 s under a broad wavelength range, respectively. This excellent performance can be attributed to the synergistic effect of the WS2 QDs/rGO-PEDOT:PSS composites. In addition, the fully flexible phototransistor prepared by composite nanomaterials coated on viscose yarn still maintains a stable performance under different bending states and has been successfully applied in the field of UV–visible visual detection and intelligent wearable optoelectronics. These results pave a simple route for the development of wearable, high-performance optoelectronic devices.
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Nanomaterials and Nanotechnology
·
2015
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IF 0.857
Linfan Cui,Tifeng Jiao,Qingrui Zhang,Jingxin Zhou,Qiuming Peng
In this study, highly efficient silver halide (AgX)-based photocatalysts were successfully fabricated using a facile and template-free direct-precipitation method. AgX nanoparticles, which included silver chloride (AgCl), silver bromide (AgBr) and silver iodide (AgI), were synthesized using different potassium halides and silver acetate as reactive sources. The size distribution of the AgX nanoparticles was determined by the reaction time and ratio of the reagents, which were monitored by UV-vis spectra. The as-prepared AgX nanoparticles exhibited different photocatalytic properties. This shows the differences for the photodegradation of methyl orange and Congo red dyes. In addition, the AgCl nanoparticle-based photocatalyst exhibited the best photocatalytic property among all three types of AgX nanoparticles that are discussed in this study. Therefore, it is a good candidate for removing organic pollutants.
研究领域:
材料科学
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环境科学
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2013
·Vol. 97
·期 1
·267-274
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IF 2.107
Jinxiu Wang,Xue Yang,Jing Chen,Jiangjun Xian,Sugang Meng,Yi Zheng,Yu Shao,Danzhen Li
In this study, pure Ag 4 V 2 O 7 was synthesized via hydrothermal method without surfactant at different temperatures (100°C, 120°C, and 140°C) and pH values (4 and 5) for the first time. Moreover, Ag 4 V 2 O 7 nanoparticles with homogeneous size distribution about 200–300 nm can be obtained by adding polyvinylpyrrolidone to the synthesis system. Effects of hydrothermal synthesis conditions on photophysical properties and photocatalytic activity of Ag 4 V 2 O 7 were investigated systematically. Ag 4 V 2 O 7 sample prepared at 120°C and pH = 4 had the optimal photocatalytic activity among these samples, which almost completely degraded 10 ppm Rhodamine B within 3 h under visible light irradiation (420 nm < λ < 800 nm). The degradation products were measured by liquid chromatography–mass spectroscopy. The active species involved in the degradation process were analyzed by means of adding active species scavengers, electron spin resonance techniques, and photoelectrochemical experiments. A possible mechanism for photocatalytic degradation of organic pollutants on Ag 4 V 2 O 7 photocatalyst was proposed and discussed preliminarily.
研究领域:
材料科学
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环境科学
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JOURNAL OF CHEMICAL PHYSICS
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2024
·Vol. 160
·期 16
·
IF 3.1
Wang Yang,Liang Pan,Men Yumeng,Jiang Meizhen,Cheng Lin,Li Jinlei,Jia Tianqing,Sun Zhenrong,Feng Donghai
Chiral quantum dots (QDs) are promising materials applied in many areas, such as chiral molecular recognition and spin selective filter for charge transport, and can be prepared by facile ligand exchange approaches. However, ligand exchange leads to an increase in surface defects and reduces the efficiencies of radiative recombination and charge transport, which restricts further applications. Here, we investigate the light-induced photoluminescence (PL) enhancement in chiral L- and D-cysteine CdSe QD thin films, providing a strategy to increase the PL. The PL intensity of chiral CdSe QD films can be significantly enhanced over 100 times by continuous UV laser irradiation, indicating a strong passivation of surface defects upon laser irradiation. From the comparative measurements of the PL intensity evolutions in vacuum, dry oxygen, air, and humid nitrogen atmospheres, we conclude that the mechanism of PL enhancement is photo-induced surface passivation with the assistance of water molecules.
研究领域:
材料科学
·
光学
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ACS Energy Letters
·
2024
·
IF 19.3
Yudong Wang,Qiuxiang Yang,Yan Li,Lin Peng,Ce Zhang,ShouNian Cheng,Yu Han,Xia Cao
Electronic skin can convert mechanical stimuli into multimodal signals and can provide a cost-effective and complementary approach to environmental sensing. Here, light-emitting PVDF-HFP/GO-ZnS:Cu (PH-GZ) composite films were synthesized for visual triboelectric nanogenerators (TENGs), which can convert mechanical stimuli into both real-time photoemission and electric signals. The lower the trigger pressure threshold, the higher the sensitive response to subtle contact. Thus, the surface topography of approaching objects can be displayed visually with high brightness according to the physical contact. A quick-response safe drawer system was thus developed, relying on TENG-based personal information identification. Only when the obtained triboelectric–photoelectric signal matches the preset code can the drawer be opened. The as-designed durable visual TENGs with an open-circuit voltage of 32 V and a short-circuit current of 4.078 mA/m2 promote self-powered TENG applications in areas of personal information security and tactile sensing systems.
研究领域:
材料科学
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电子工程
·
纳米技术
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Nature Chemistry
·
2024
·Vol. 16
·期 3
·373-379
·
IF 19.2
Guan Yeqin,Wen Hong,Cui Kaixun,Wang Qianru,Gao Wenbo,Cai Yongli,Cheng Zibo,Pei Qijun,Li Zhao,Cao Hujun,He Teng,Guo Jianping,Chen Ping
Photon-driven chemical processes are usually mediated by oxides, nitrides and sulfides whose photo-conversion efficiency is limited by charge carrier recombination. Here we show that lithium hydride undergoes photolysis upon ultraviolet illumination to yield long-lived photon-generated electrons residing in hydrogen vacancies, known as F centres. We demonstrate that photon-driven dehydrogenation and dark rehydrogenation over lithium hydride can be fulfilled reversibly at room temperature, which is about 600 K lower than the corresponding thermal process. As light-driven F centre generation could provide an alternative approach to charge carrier separation to favour chemical transformations that are kinetically or thermodynamically challenging, we show that light-activated lithium hydride cleaves the N≡N triple bond to form a N–H bond under mild conditions. Co-feeding a N 2 /H 2 mixture with low H 2 partial pressure leads to photocatalytic ammonia formation at near ambient conditions. This work provides insights into the development of advanced materials and processes for light harvesting and conversion.
研究领域:
化学
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材料科学
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催化
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光化学
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Li Su,Zijun Hu,Tingting Yan,Xinglong Zhang,Dawei Zhang,Xiaosheng Fang
With the development of artificial intelligence systems, it is necessary to develop optoelectronic devices with photoresponse and storage capacity to simulate human visual perception systems. The key to an artificial visual perception system is to integrate components with both sensing and storage capabilities of illumination information. Although module integration components have made useful progress, they still face challenges such as multispectral response and high energy consumption. Here, we developed a light-adapted optoelectronic-memristive device integrated by an organic photodetector and ferroelectric-based memristor to simulate human visual perception. ITO/P3HT:PC71BM/Au as the light sensor unit shows a high on/off ratio (Iph/Id) reaching ∼5 × 104 at 0 V. The memristor unit, consisting of ITO/CBI@P(VDF-TrFE)/Cu, has a RON/ROFF ratio window of ∼106 under 0.05 V read voltage and ultralow power consumption of ∼1 pW. Moreover, the artificial visual perception unit shows stable light-adapted memory windows under different wavelengths of irradiation light (400, 500, and 600 nm; they meet the spectral range of human visual recognition) and can clearly identify the target image (“T” shape) because of the apparent contrast, which results from the high ROFF/RON ratio values. These results provide a potential design strategy for the development of intelligent artificial vision systems.
研究领域:
生物医学工程
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人工智能
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材料科学
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Nano-Micro Letters
·
2025
·Vol. 17
·期 1
·1-15
·
IF 36.3
Dong Kailian,Jiang Tao,Chen Guoyi,Cui Hongsen,Wang Shuxin,Zhou Shun,Wang Chen,Yang Yi,Yao Fang,Tao Chen,Ke Weijun,Fang Guojia
The light management strategy is introduced into two-dimensional Dion-Jacobson (2D DJ) perovskite and subsequently elucidated both experimentally and theoretically.
The synthesis of surface-patterned BDAPbBr 4 microplates with high crystalline quality demonstrates the first reported instance of growing such 2D DJ-type perovskite microplates.
The optimized device exhibits excellent photodetection performance under UV region. Moreover, this work represents the successful demonstration of BDAPbBr 4 perovskite for UV weak-light communication, imaging, and polarized light detection.
研究领域:
材料科学
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光学工程
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Frontiers of Optoelectronics
·
2024
·Vol. 17
·期 1
·1-7
·
IF 4.1
Li Zha,Li Wancai,Li Dehui,Tang Wei,Liang Huageng,Song Huaibing,Chen Chao,Gao Liang,Tang Jiang
Chiral inorganic semiconductors with high dissymmetric factor are highly desirable, but it is generally difficult to induce chiral structure in inorganic semiconductors because of their structure rigidity and symmetry. In this study, we introduced chiral ZnO film as hard template to transfer chirality to CsPbBr 3 film and PbS quantum dots (QDs) for circularly polarized light (CPL) emission and detection, respectively. The prepared CsPbBr 3 /ZnO thin film exhibited CPL emission at 520 nm and the PbS QDs/ZnO film realized CPL detection at 780 nm, featuring high dissymmetric factor up to around 0.4. The electron transition based mechanism is responsible for chirality transfer. Graphical Abstract
研究领域:
材料科学
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光学
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CHEMISTRY OF MATERIALS
·
2023
·
IF 8.6
Meiqing Yang,Yuanchen Dong,Chuang Li
Living organisms operate far from equilibrium in order to maintain their adaptive structures and functions by continuous energy consumption. The development of synthetic out-of-equilibrium systems using light as an input fuel will allow for remote and noninvasive control over a range of important chemical/biological processes. Here, we report on the rational design of light-fueled DNA hydrogels that exhibit life-like nonequilibrium and dissipative features. Such hydrogels are formed through a two-component mixing strategy, where merocyanine photoacid bearing a robust pH-adjustment capability delicately imparts photoinactive but pH-sensitive DNA components with an adaptive response to light. The transient hydrogel spontaneously dissipates to its sol state in the dark, enabling a highly reversible sol–gel transition that is fine-tuned by irradiation conditions. We construct reprogrammable DNA hydrogel shapes/patterns by alternating the photopatterning/dark-erasing processes using a single recyclable ink. Our work provides a general waste-free approach to developing other light-fueled out-of-equilibrium hydrogels for applications in smart materials and soft robotics.
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