ACS Sensors
·
2025
·
IF 9.1
Huijuan Chen,Li Lv,Kaifeng Xue,Pinhua Zhang,Lulu Du,Guangliang Cui
Developing a portable and compact sensor for room temperature detection of H2S in exhaled breath for health assessment presents considerable technical challenges. This work successfully synthesized Cu2O/ZnO heterostructures with excellent gas sensitivity to H2S at room and lower temperatures using a two-dimensional (2D) electrodeposition in situ assembly method with the application of a semisine wave voltage as well as CuZnO nanoarrays deposited under direct current voltage. The Cu2O/ZnO heterostructure sensors, with high response of 8.53 × 104 to 1 ppm of H2S and a minimum detection limit of 10 ppb at room temperature, exhibit a response of 42 for 10 ppm of H2S even at −20 °C, and its response to 50 ppm of H2S is approximately 3774 times greater than that of the CuZnO sensor, which is a significant challenge to achieve with sensors based on oxygen adsorption/desorption mechanisms. These outstanding gas-sensing properties are attributed to the formation of p–n heterojunctions in the Cu2O/ZnO heterostructures and the occurrence of the sulfuration reaction. In addition, we successfully employed the Cu2O/ZnO sensor to detect H2S in human exhaled breath, offering valuable insights for the monitoring of various chronic diseases and new directions for the development of portable room-temperature breath sensors.
研究领域:
材料科学
·
医学诊断
·
传感器技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL
·
2025
·
IF 7.5
Xiaochao Xu,Jiaxin Zou,Zhen Xiao,Jiangjie zhang,Bing Wang,Jianing Jiang,Jinni Shen,Lifang Yang,Wenxin Dai,Zizhong Zhang
Controlling the crystallinity and microstructure of a semiconductor photocatalyst serves as an effective means to boost its photocatalytic performance through improving the charge transfer and separation, enhancing the light absorption, or maneuvering the surface reactions. Nevertheless, the internal pores in aerogel materials inevitably collapse during the traditional high temperature crystallization process, significantly reducing the porous structure and specific surface area (SSA). Herein, microsphere ZnO aerogels have been successfully fabricated for photoreduction of CO 2 using a cooperative strategy of sol–gel method, solvothermal crystallization and cryodesiccation. The obtained aerogel has a large SSA and high crystallinity. Compared with the commercial ZnO powder, the ZnO aerogel microsphere exhibits about 4-fold increase in specific surface area, leading to an increased contact surface between the photocatalyst and the reactant. At the same time, ZnO aerogel with microsphere morphology possesses high light-harvesting and intrapore light reflecting capabilities, demonstrating enhanced optical utilization. Modulation of the crystallinity of ZnO aerogel facilitated the incorporation of defect engineering (zinc defects (Zn i ) and oxygen vacancies (V o )). As a result, ZnO aerogel microsphere exhibits a 5-fold higher products production rate than ZnO powder for photocatalytic CO 2 reactions due to the synergistic effect of appropriate crystallinity and microsphere appearance. It is hoped that this work may provide some insights to tune the catalyst performance through crystallinity and morphology.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Nanomaterials
·
2016
·
IF 1.758
Wenhui Zhang,Lijuan Du,Zongren Chen,Juan Hong,Lu Yue
ZnO nanocrystals were synthesized via a thermal decomposition method. X-ray diffraction, transmission electron microscopy, and photoluminescence were used to investigate the composition and nanostructure of the material. Compared with commercial ZnO nanoparticles, ZnO nanocrystals showed higher lithium storage capacity and better cycling characteristics and exhibited a reversible discharge capacity of 500 mAh g−1 after 100 cycles at 200 mA g−1.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED THERMAL ENGINEERING
·
2016
·
IF 3.043
Zhiping Zuo,Ruijin Liao,Xuetong Zhao,Xiaoyu Song,Zhiwei Qiao,Chao Guo,Aoyun Zhuang,Yuan Yuan
A superhydrophobic (SHP) surface is believed to be potential candidates for anti-icing/frosting applications. In this study, a SHP surface with ZnO nanorods was fabricated through radio frequency (RF) magneton sputtering method. The XRD pattern, surface morphology, wettability and chemical composition were characterized by corresponding methods. The anti-frosting property and mechanism of frost propagation on surfaces exhibiting various degrees of wettability were investigated on a Peltier-based platform. Compared with the bare glass surface and a permanent-room-temperature-vulcanized silicon rubber-coated glass surface, the as-prepared SHP ZnO surface displays excellent anti-frosting property. Frost formation on the as-prepared SHP ZnO surface was delayed for 140 min at −10 °C. A large gap free of condensed water droplets formed on the as-prepared SHP ZnO surface because of the self-propelled movement and absorption of condensed water droplets by the frost front. As a consequence, the frost propagation rate is effectively reduced. Moreover, after 30 cycles of frosting/defrosting process, no evident degradation of the as-prepared SHP ZnO surfaces was observed, indicating fair durability against repetitive frosting/defrosting process. Our study provides insights into the mechanism of anti-frosting property of nanostructured SHP surfaces and proposes a potential method to fabricate an anti-frosting surface.
研究领域:
材料科学
·
表面工程学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2018
·
IF 5.091
Bing Xue,Yingquan Zou
In this work, ZnO nanoparticles-reduced graphene oxide (rGO) composites were fabricated via a novel one-step photochemical method . The developed nanocomposite offered high photodegradation efficiency of methylene blue (MB) under UV and visible light. In the proposed route, the reduction of graphene oxide (GO) and formation of ZnO nanoparticles occurred simultaneously, which results in high synthesis efficiency of ZnO/rGO nanocomposites. The electron microscopy confirmed that the ZnO nanoparticles were uniformly anchored on rGO sheets. The structure and quality of prepared nanocomposite were assessed by X-ray diffraction, Fourier transform infrared (FT-IR) spectroscopy, Raman spectroscopy , and X-ray photoelectron spectroscopy (XPS). Furthermore, the synthesis of the nanocomposite and degradation of MB, along with a mechanistic insight, is discussed in detail.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Polymers
·
2023
·Vol. 15
·期 8
·1906
·
IF 5
Xinxin Liu,Dengbang Jiang,Yuyue Qin,Zhihong Zhang,Mingwei Yuan
With the increasing environmental pollution caused by disposable masks, it is crucial to develop new degradable filtration materials for medical masks. ZnO-PLLA/PLLA (L-lactide) copolymers prepared from nano ZnO and L-lactide were used to prepare fiber films for air filtration by electrospinning technology. Structural characterization of ZnO-PLLA by H-NMR, XPS, and XRD demonstrated that ZnO was successfully grafted onto PLLA. An L9(43) standard orthogonal array was employed to evaluate the effects of the ZnO-PLLA concentration, ZnO-PLLA/PLLA content, DCM(dichloromethane) to DMF(N,N-dimethylformamide) ratio, and spinning time on the air filtration capacity of ZnO-PLLA/PLLA nanofiber films. It is noteworthy that the introduction of ZnO is important for the enhancement of the quality factor (QF). The optimal group obtained was sample No. 7, where the QF was 0.1403 Pa−1, the particle filtration efficiency (PFE) was 98.3%, the bacteria filtration efficiency (BFE) was 98.42%, and the airflow resistance (Δp) was 29.2 Pa. Therefore, the as-prepared ZnO-PLLA/PLLA film has potential for the development of degradable masks.
研究领域:
材料科学
·
环境科学
·
医学
✓ 已验证
DOI
PubMed
高影响因子
ACS Omega
·
2022
·
IF 4.132
Danting Xu,Xia Zhu,Jiakun An,Gaoyu Chen,Jianchun Bao,Xiangxing Xu
As a narrow band semiconductor at room temperature and a metallic material above ∼68 °C, functional VO2 films are widely investigated for smart windows, whereas their potential for ultraviolet–visible–infrared (UV–vis–IR) broad spectral photodetectors has not been efficiently studied. In this report, photodetectors based on VO2–ZnO nanocrystal composite films were prepared by nanocrystal-mist (NC-mist) deposition. An enhanced photodetection switching ratio was achieved covering the ultraviolet to infrared wavelength. Due to the synergetic effect of nanosize, surface, phase transition, percolation threshold, and the band structure of the heterojunction, the transfer and transport of photogenerated carriers modulate the device performance. This study probes new chances of applying VO2-semiconductor-based nanocomposites for broad spectral photodetectors.
研究领域:
材料科学
·
光电子学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2018
·
IF 4.229
Zexiao Zheng,Xukai Li,Laisheng Li,Yiming Tang
Quaternary semiconductor film consists of ZnO, ZnSe, CdSe and MoS 2 was designed to establish a core-shell structure to achieve the photoelectrochemical oxidation of amoxicillin . The hybrid photoelectrode was fabricated on a FTO substrate from bath deposition methods . The hierarchical ZnSe/CdSe/MoS 2 shell was covered uniformly on ZnO nanorod core which provided a direct pathway for electron transfer , large surface area to enhance light absorption and increase active sites. The quaternary photoelectrode exhibited a photocurrent density of 26.86 mA/cm 2 at 0 V vs. Ag/AgCl under UV–visible light illumination, which was 31.9 times, 16.7 times and 1.6 times of that of the bare ZnO nanorods, binary ZnO/ZnSe and ternary ZnO/ZnSe/CdSe photoelectrodes, respectively. 10 ppm of amoxicillin was completely degraded in 30 min by the quaternary working electrode with an applied bias of 0.5 V vs. Ag/AgCl. The reusability and stability of quaternary electrode was demonstrated by 3-run recycling experiments. The enhanced photoelectrochemical performance of quaternary photoelectrode can be attributed to the enhancement of light absorption and increased active sites from the coverage of visible-active layers, the accelerated charge separation from the formation of p-n junction and reduced photocorrosion of CdSe from the protection of MoS 2 on the surface.
研究领域:
环境科学
·
材料科学
·
光电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2023
·
IF 6.1
Wei Rong,Meili Ding,Pan Ma,Suyu Kong,Jianfeng Yao
Accumulation of atmospheric CO 2 poses a serious threat to the global environment, but there is still a lack of effective CO 2 catalytic conversion under mild conditions. Herein, multifunctional ZnO/N-doped porous carbon materials, ZNPC-X, were fabricated by pyrolysis of available pine pollen with melamine and zinc chloride . The optimized ZNPC-600 produced at 600 °C can work as an efficient photothermal catalyst towards CO 2 cycloaddition conversion with a high catalytic yield of 99% under mild conditions (0.3 W/cm 2 , 1 bar). Moreover, ZNPC-600 shows excellent recyclability after ten cycles and desirable performance even under simulated flue gas and after moisture treatment. Absorption spectra and time-dependent infrared images unveil that the intrinsically broad light absorption and high photothermal conversion efficiency are the major reasons for the high activity of ZNPC-600. Besides, photogenerated electrons can be transferred to CO 2 and activate it, while photogenerated holes can be used as Lewis acid to facilitate the ring opening of epoxides. In addition, the hierarchical pore structure and the synergy between ZnO and pyridine N also play a role in the mass transfer and activation of epoxides and CO 2 , respectively. This work provides a low-cost and facile solution to obtain catalysts derived from biomass for promoting CO 2 conversion.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Yegang Xia,Xingwen Cha,Xing Yan,Xueying Wang,Yanmei Cai,Kok Bing Tan,Jinxin He,Ting Qiu,Dongren Cai,Guowu Zhan
Regulation of abundant Cu-ZnO interfaces in Cu/ZnO catalysts is critical to the thermal hydrogenation of CO 2 to methanol. Herein, Cu-ZnO interfaces were precisely regulated by depositing thin ZnO films on copper phyllosilicates (CuSiO 3 ) through atomic layer deposition (ALD) to prepare Cu/ZnO/SiO 2 composite catalysts (denoted as x ZnO/CuSiO 3 , x is the number of ALD cycles) for CO 2 hydrogenation to methanol. Interestingly, 5ZnO/CuSiO 3 exhibited much higher methanol selectivity of 68.1 % and methanol space-time yield (STY MeOH ) of 0.39 g MeOH h −1 g cat −1 toward CO 2 hydrogenation at 275 ℃ and 3 MPa, as compared to the pristine CuSiO 3 (38.1 % and 0.24 g MeOH h −1 g cat −1 ), suggesting the significant role of Cu-ZnO interfaces. Compared to ZnO/CuSiO 3 (IM) prepared by the conventional impregnation method, 5ZnO/CuSiO 3 possessed much higher CO 2 conversion (13.8 % vs. 10.1 %) and methanol selectivity (68.1 % vs. 56.2 %). Furthermore, the catalytic activities of the prepared Cu/ZnO catalysts can be effectively regulated by changing the thickness of ZnO-ALD films, in which 5ZnO/CuSiO 3 showed the best catalytic activity. Various characterization methods were applied to demonstrate that ALD-ZnO was evenly laid flat on the surface of CuSiO 3 to construct abundant Cu-ZnO interfaces during the H 2 reduction treatment, which facilitated the dissociated activation of CO 2 and formation of CH 3 O* reaction intermediate and simultaneously inhibited the generation of CO byproduct. In addition, the density functional theory (DFT) calculations revealed the stronger interaction between Cu and ZnO over 5ZnO/CuSiO 3 , which implied more Cu-ZnO interfaces were generated for methanol production. Accordingly, this study verifies the significance of Cu-ZnO interfaces for CO 2 hydrogenation to methanol and provides a facile method to regulate Cu-ZnO interfaces by depositing ALD-ZnO films on the copper phyllosilicate precursor.
研究领域:
催化化学
·
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2017
·
IF 4.208
Jingjing Du,Yuyan Zhang,Lina Liu,Mingxiang Qv,Yanna Lv,Yifei Yin,Yinfei Zhou,Minghui Cui,Yanfeng Zhu,Hongzhong Zhang
ZnO nanoparticles is one of the most used materials in a wide range including antibacterial coating, electronic device, and personal care products. With the development of nanotechnology, ecotoxicology of ZnO nanoparticles has been received increasing attention. To assess the phototoxicity of ZnO nanoparticles in aquatic ecosystem , microcosm experiments were conducted on Populus nigra L. leaf litter decomposition under combined effect of ZnO nanoparticles and visible light radiation . Litter decomposition rate, pH value, extracellular enzyme activity , as well as the relative contributions of fungal community to litter decomposition were studied. Results showed that long-term exposure to ZnO nanoparticles and visible light led to a significant decrease in litter decomposition rate (0.26 m −1 vs 0.45 m -1 ), and visible light would increase the inhibitory effect (0.24 m -1 ), which caused significant decrease in pH value of litter cultures, fungal sporulation rate, as well as most extracellular enzyme activities. The phototoxicity of ZnO nanoparticles also showed impacts on fungal community composition, especially on the genus of Varicosporium , whose abundance was significantly and positively related to decomposition rate. In conclusion, our study provides the evidence for negatively effects of ZnO NPs photocatalysis on ecological process of litter decomposition and highlights the contribution of visible light radiation to nanoparticles toxicity in freshwater ecosystems .
研究领域:
生态学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
VACUUM
·
2023
·
IF 4
Xueyuan Bai,Kaiyi Luo,Wen Cui,Zhengshang Wang,Zhenyu Ma,Xiaoyi Wang,Wenchao Zhang,Xudong Cui
Within the realm of advancing photocatalysis , the investigation of material defects has perennially commanded paramount attention. However, a nuanced comprehension of the intricate interplay between these defects and the catalytic milieu necessitates deeper exploration. In the present study, oxygen vacancies (Vo) were adeptly harnessed to induce precise carrier localization, thereby effectuating a heightened augmentation of photocatalytic activity . This augmentation was deftly achieved through the deliberate modulation of external illumination parameters, resulting in the extension of carrier lifetimes. Specifically, the drastically enhanced carrier effective mass (m*) and the density of unoccupied state are directly uncovered by the density functional theory (DFT) calculation and Raman spectra . Through the utilization of wavelength dispersive in-situ fluorescence spectroscopy (WDIFS) experiments, it was observed that Vo-rich ZnO nanoparticles (NPs) displayed noteworthy photocatalytic activity around the central frequency of Vo (5.17 × 10 14 Hz, 580 nm), owing to the highly efficient utilization of localized carriers. Moreover, based on Einstein rate equations, the charge carrier lifetime was found to be further prolonged with increased external illumination intensity and excitation wavelength. This work provides a methodology for optimizing the functionality of point defect on photocatalysis, where the photo-induced charge carrier localization is expected to be extensively used in further photocatalysis research.
研究领域:
材料科学
·
光催化
·
理论计算
✓ 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）