JOURNAL OF LUMINESCENCE
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2023
·
IF 3.6
Zihan Yin,Yang Zeng,Dongmei Yang,Yang Jiao,Jiaming Song,Peng Hu,Haibo Fan,Feng Teng
Combining ZnO materials and other narrow bandgap materials is an effective route to construct high performance optoelectronic devices. Herein, a multifunctional optoelectronic device based on CuO/ZnO p-n junction was prepared by growing ZnO nanorod arrays on CuO film. The obtained device not only can be used as self-powered photodetector in a wide spectral range, but also as a photo-induced binary response device. The obtained self-powered photodetector can operate in UV–vis–NIR region. The maximum responsivity of 1.24 μA∙W −1 , specific detectivity of 9.77 × 10 6 Jones, and response/recovery time of ∼20 ms were achieved at zero bias when the device was irradiated by 405 nm light (55 mW cm −2 ). The thickness of CuO film has significant influence on the performance of photodetectors. The built-in field at the interface of CuO and ZnO makes the device operate without any external power supply. The obtained device also exhibits a photo-induced binary response characteristic at a small forward bias, showing great application potential in light communication systems and optical chips.
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ChemistrySelect
·
2023
·Vol. 8
·期 25
·e202301101
·
IF 2.1
Jiali Zhai,Huan Jiang
Graphical A novel solid-state fluorescent ZnO@SiO 2 nanocapsules powder with a fluorescence quantum yield of 26.8 % has been fabricated and successfully applied to fast latent fingerprint imaging. As advanced fingerprint powders, fluorescent materials generally provide high sensitivity and improved contrast on the pigments or patterned surface, with high resolution. In this study, ZnO nanoparticles are used as fluorescent materials and are homogeneously embedded into SiO 2 matrix to prepare ZnO@SiO 2 nanocapsules. Compared with conventional methods, ZnO@SiO 2 nanocapsules are fabricated using the transparent ethanol solution of ZnO NPs and n-Octyltriethoxysilane without any surfactants. Interestingly, a large number of ZnO NPs can be homogeneously embedded in the silica matrix, reducing the aggregation-induced quenching effect. The maximum emission of the ZnO@SiO 2 nanocapsules powder is located at 530 nm under 325 nm irradiation, and the photoluminescence intensity and the sensitivity of latent fingerprints development depend on the quantity of ZnO NPs in the composites. The prepared fluorescent ZnO@SiO 2 nanocapsules show outstanding property applied as effective fluorescent eikonogens for the high-sensitivity visualization of latent fingerprints on different porous and non-porous substrates. It has been demonstrated that ZnO@SiO 2 nanocapsules compounds combine the admirable adhesion of silica powders to fingerprint residues with the excellent photoluminescence properties of ZnO to form a promising light-emitting material for fingerprint.
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Xinhong Zhao,Yu Tao,Jixiang Dong,Yongchu Fang,Xiaoxian Song,Zaoxue Yan
Wearable, portable, and biocompatible optoelectronic devices made of all-green and abundant materials and fabricated by low-temperature solution method are the key point in the development of next generation of intelligent optoelectronics. However, this is usually limited by the weaknesses of mono-component materials, such as non-adjustable photoresponse region, high carrier recombination rate, high signal-to-noise ratio, as well as the weak mechanical flexibility of bulk films. In this work, the Cs3Cu2I5/ZnO heterostructure flexible photodetectors were constructed by a low-temperature solution method combined with spin-coating technique. The heterostructure combines the low dark current and strong deep ultraviolet absorption of Cs3Cu2I5 quantum dots with the high carrier mobility of ZnO quantum dots as well as the efficient charge separation of the vertical p–n junction, to improve the photodetection performance. The heterostructure shows enhanced light/dark current ratio and ultraviolet-to-visible rejection ratios. Under an illumination of 280 nm light, an optical detectivity as high as 1.26 × 1011 Jones was obtained; the optical responsivity and response time are much better than those of control devices. After 300 times of 180° bending cycles, the photocurrent had no obvious change. The results demonstrate that the Cs3Cu2I5/ZnO heterostructure has great potential in wearable and portable visible-blind ultraviolet optoelectronic devices.
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PubMed
高影响因子
VACUUM
·
2022
·
IF 4.11
Hua-Dong Dong,Jian-Ping Zhao,Ming-Xing Peng,Yong-Hui Zhang,Pei-Yuan Xu
With the rise of H 2 production from water electrolysis, H 2 fuel cell and other H 2 industry, the development of H 2 detection equipment is urgent. In this work, fusiform ZnO sensitive material was synthesized by hydrothermal and photodeposition method, and Au nanoparticles were loaded on its surface by photodeposition method. The size and length of the synthesized samples are about 1 μm and 5 μm, and Au nanoparticles are evenly distributed on the surface. The XRD , FESEM, TEM and XPS characterizations of the Au-loaded ZnO (AZO) composites were collected to investigate their compositions and structures. The as-synthesized materials were applied to fabricate sensors to study their gas sensing performance. After Au modification, the H 2 sensing performance of the sensitive material is enhanced obviously. The response of AZO (Au-loaded ZnO) to 100 ppm H 2 at 230 °C is 37.6, which is 4.5 times higher than that of pure ZnO. In addition, the cross response of AZO based gas sensor to different gases was evaluated, and its sensing performance was tested for one month. The results show that AZO sensitive materials have good selectivity and long-term stability for H 2 .
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Optoelectronics Letters
·
2021
·Vol. 17
·期 12
·751-756
·
IF 0
Yang Chen,Gu Weiyuan,Yu Shuguo,Zhang Hongyan
In this study, using surfactant monoethanolamine (MEA), zinc oxide (ZnO)-MEA humidity sensor based on ZnO was successfully prepared by hydrothermal method. MEA makes the surface of the ZnO-MEA have more oxygen vacancy and hydrophilic functional groups, which improves the performance of ZnO humidity sensor. ZnO-MEA achieved a change of 4 orders of magnitude at room temperature in the relative humidity (RH) from 11% to 95%, and it shows better linearity, shorter response/recovery time (20 s/15.9 s), smaller humidity lag and long-term stability. In addition, the distribution of ZnO-MEA particles is more uniform and provides more active sites for adsorption of water molecules to enhance humidity sensing performance.
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Catalysts
·
2021
·Vol. 11
·期 5
·572
·
IF 4.146
Zhou Zhou,Jing Wang,Chul Gyu Jhun
The preparation of high specific area (86.5 m2/g) ZnO nanospheres with good photocatalytic efficiency via a simple, green and efficient mechanochemical method was reported in this work. The products were characterized by XRD, SEM, TEM, BET and UV–Vis. The ball milling parameters were improved to reduce the agglomeration hazard during the ball milling process, and the specific surface area, band gap and photocatalytic efficiency were investigated in relation to ball milling time. Our study developed the opportunity for the low-cost and facile synthesis of a high specific surface area photocatalyst on a large scale for future industrial applications.Keywords:ZnO;high specific area;mechanochemistry;nanospheres;photocatalytic;RhB
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ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Pan Li,Haifeng Hu,Gan Luo,Shuang Zhu,Lingju Guo,Peng Qu,Qi Shen,Tao He
Crystal facet engineering provides a promising approach to tailor the performance of catalysts because of the close relationship between the photocatalytic activity and the surface atomic and electronic structures. An in-depth understanding mechanism of crystal facet-dependent CO2 photoreduction is still an open question. Herein, two different types of porous ZnO nanocatalysts are used as model photocatalysts for the investigation, which are, respectively, with exposed {110} and {001} facets. The porous ZnO with an exposed {110} facet exhibits superior photocatalytic activity to the one with the {001} facet. Various influencing factors have been thoroughly studied both theoretically and/or experimentally, including light harvesting (i.e., band gap), reduction capability (potential of conduction band), crystallinity, CO2 adsorption ability, CO2 activation, and charge separation. The major influencing factors are eventually figured out based on the experimental and calculation results. The product selectivity and the influence of the hole scavenger can be explained too. Our work may pave a way for directing the future rational design of efficient photocatalysts for CO2 reduction.
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高影响因子
Journal of Physical Chemistry C
·
2021
·
IF 4.126
Zhaolong Xie,Menghuan Chen,Yangshen Chen,Anxiang Guan,Qing Han,Gengfeng Zheng
The direct conversion of methane to value-added chemicals at ambient conditions is a long-awaited perspective, and the electrocatalytic methane oxidation reaction (CH4OR) offers the potential of utilizing abundant natural gas and renewable energy sources. However, due to the competition of water oxidation and the overoxidation of methane, CH4OR has remained as a significant challenge. In this work, we developed Rh/ZnO nanosheets as an effective catalyst for electrochemical conversion of methane into ethanol. The highly dispersed rhodium nanoparticles provided surface sites for methane adsorption, and ZnO allowed presentation of abundant active oxygen species for methane activation. With a 0.6% Rh doping ratio, the Rh/ZnO nanosheets demonstrated an excellent ethanol production rate of 789 μmol·gcat–1·h–1 at 2.2 V versus reversible hydrogen electrode, corresponding to a Faradaic efficiency of 22.5% and an ethanol production selectivity of 85%, suggesting a promising means for methane utilization at ambient conditions.
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DYES AND PIGMENTS
·
2019
·
IF 4.018
Jinpeng Lv,Jianqun Yang,Xingji Li,Ziyi Chai
ZnO and TiO 2 particles are typical pigments used in solar reflective coatings . In this letter, the radiation stability of ZnO and TiO 2 particles within submicron (several hundred nm) and nanoscale (30 nm) size is systematically studied. We reported previously that the 90 nm and 300 nm ZnO particles have nearly a same radiation tolerance (Phys. Status Solidi B 2017, 254, 1600411). Unexpectedly, we found herein that the 30 nm oxides have significant higher radiation tolerance in relation to the submicron particles. Detailed analysis illustrated that the abundant native defects and surface/interface states in oxides nanocrystals , in-situ restored radiation damage through rapid diffusion and annihilation with implantation created vacancies. This work would be beneficial for developing nanoscaled oxides and devices used for space and nuclear radiative environments.
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Journal of Inorganic and Organometallic Polymers and Materials
·
2019
·Vol. 29
·期 5
·1738-1745
·
IF 1.637
Li Minjia,Chen Feng,Liu Chengbao,Qian Junchao,Wu Zhengying,Chen Zhigang
Polytetrafluoroethylene (PTFE)/polyvinyl alcohol (PVA)/ZnO composite fiber membranes were prepared by electrospinning, and PTFE/ZnO composite films were obtained after removing PVA. Considering that the spinning solution has good spinning performance, the PTFE/ZnO composite film has good flexibility and durability. The zinc oxide powder is evenly fixed on the surface of PTFE fibers, so that the film’s flexibility will not be affected during high-temperature calcination. The scanning electron micrograph shows that the morphology of the film is similar to the surface of the lotus leaf. The properties of PTFE/ZnO composite films were investigated by hydrophobic angle test and oil–water separation experiments. Results show that the PTFE/ZnO composite film has good hydrophobicity and oil–water separation performance. With the decrease in ZnO, the contact angle of the PTFE/ZnO composite film increased, and the oil–water separation performance improved. When the amount of ZnO added was 0.025 g, the contact angle was 160.9°, and the oil–water separation performance was the best.
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OPTIK
·
2019
·
IF 1.914
Benze Wu,Jin Li,Qiang Li
The Mn-doped nano-ZnO powder was successfully synthesized via co-precipitation and vacuum annealing and the scanning electron microscopy (SEM), X-ray diffracton (XRD), ultraviolet visible absorption (Uv–vis) and photoluminescence (PL) of as-synthesized samples were characterized. The SEM and XRD show that the morphology of the synthesized samples was wurtzite nanosheets and nanoparticles at low doping concentration and with increasing Mn-doping concentration, mainly became to nanoparticle with a size of about 50nm. All of the ultraviolet absorption edges of Mn-doped ZnO have blue shift from Uiv-vis spectra and PL spectra show that Mn-doping significantly enhance the visible excitation band compared with pure ZnO, which indicates that Mn-doping not only produces elemental energy levels, but also affects the intrinsic defect energy levels of ZnO.
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JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2018
·Vol. 86
·期 2
·459-467
·
IF 1.745
Yao Lili,Sun Yu,Weng Wenjian,Lin Jun,Cheng Kui
In the present study, TiO 2 /ZnO composite nanodot films were prepared and the effects of Zn incorporation on light-induced cell detachment were investigated. The nanodots films, which were successfully synthesized by phase-separation-induced self-assembly method, were characterized on the morphology, composition, microstructure, and other properties, and evaluated on cell compatibility and cell detachment performances as well. Live-dead staining was used to study the viability of cell sheet detached by light illumination. Results shows that with the increasing of introduced Zn, the band gap widened and the absorbance in UV region increased, while the crystallinity and performance of light-induced hydrophilicity weakened. All the nanodots films showed good cell compatibility and cell detachment performance induced by light. The nanodots film which had a Zn/Ti molar ratio of 0.03 showed the highest detachment ratio of 91.0% after 20 min ultraviolet illumination. The prepared TiO 2 /ZnO composite nanodots films could be helpful in optimizing light-induced cell detachment behavior.
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