CRYSTENGCOMM
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2014
·Vol. 16
·期 46
·10624-10630
·
IF 3.858
Miao Wang,Tongming Sun,Yujun Shi,Guoqing Jiang,Yanfeng Tang
3D hierarchical ZnOHF nanoflowers with mean diameter of 200 nm have been synthesized via a simple template-free hydrothermal route by using (NH4)2SiF6 as the fluoride source. The crystalline phase and morphologies of the as-prepared products have been characterized by XRD, SEM and TEM. The XRD results show that the products are well-crystallized orthorhombic phase of ZnOHF. The SEM and TEM results indicate that the ZnOHF nanoflowers are assembled by numerous nanoflakes with mean thickness of 20 nm. Some factors influencing the morphologies of the ZnOHF nanostructures have been systematically investigated, such as the reaction time, temperature and fluoride source. A growth mechanism is proposed on the basis of a series of time-dependent morphological evolution results. The hierarchical ZnOHF nanoflowers exhibit a high specific surface area up to 97.1919 m2 g−1 with a pore size of 50.098 nm. The as-obtained ZnOHF can be transformed into ZnO nanoflowers by calcination in air at 600 °C. The photocatalytic properties of ZnOHF have been studied by the decomposition of methyl orange (MO) under UV light irradiation. The results indicate that the flower-like ZnO nanostructures are chemically stable, and the efficiency remained almost the same after five times recycling.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Zhidong Jin,Jinbo Zhao,Chuanzhi Chen,Huan Zhou,Nan Xiang,Fei Liu,Lin Liu,Jiurong Liu,Yue Mou,Lili Wu
Constructing heterojunctions in semiconductor-based sensors is a vital method of modulating electronic structures and designing high-performance sensors for toxic gas detection. In this study, F-doped SnS x (F-SnS x ) decorated ZnOHF composites were acquired via a two-step solvothermal method . The experimental results confirmed the establishment of heterojunctions between ZnOHF and F-SnS x . The optimized F-SnS x decorated ZnOHF snowflake-like nanoflowers-based NO 2 sensors exhibited incomparable selectivity along with supreme sensitivity (S = 137–10 ppm NO 2 at 200 ℃), rapid responding/recovering speed (34 s/6 s) and low detection limit (50 ppb). NO 2 sensing mechanism and the influence of humidity interference on NO 2 sensing performances were fully discussed. This work not only evidences the great potential of F-SnS x /ZnOHF snowflake-like nanoflowers for NO 2 recognitions but also paves a feasible routine for advancing NO 2 sensing performances by electronic structure regulations.
研究领域:
材料科学
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环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Yan-nan Wang,Zhijia Liao,Jin Li,Fanli Meng
This study presents a room temperature triethylamine (TEA) gas sensor based on the macro-bend fiber. The sensor achieves the rapid and high sensitivity measurement of TEA gas by coating the bending section of the optical fiber with ZnOHF-ZnO nanomaterial . The macro-bend fiber structure increases the penetration depth of the evanescent field transmitting along the no-core optical fiber (NCF), what allowing more light to leak into layer of the gas-sensitive material and thus enhancing the sensitivity to TEA gas. Different sensing probes were fabricated and compared for the coating layers with ZnOHF and ZnOHF-ZnO, respectively. The results showed that the sensitivity of the ZnOHF-ZnO coated sensor was 0.0044 dB/ppm, which was three times higher than that of the ZnOHF-coated sensor. Other sensing performance was experimentally demonstrated with a limit of detection (LOD) of 1 ppm, a response time of 16 s, and a recovery time of 18 s, enabling fast detection for TEA gas. Finally, the working mechanism has been explained. This macro-bend fiber-based TEA gas sensor has the advantages of small size, low operating temperature, fast response time, and good selectivity, making it suitable for the rapid identification and detection of TEA gas.
研究领域:
材料科学
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传感技术
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Zhidong Jin,Jinbo Zhao,Lin Liu,Fei Liu,Dewen Zhao,Zhou Wang,Fenglong Wang,Jiurong Liu,Yue Mou,Lili Wu
Realizing nitrogen dioxide (NO 2 ) detections based on semiconductor-based gas sensors with high tolerance to humidity conditions is deemed to be a long-term challenge. To independently acknowledge the physiosorbed-water influence mechanism on semiconductor-based sensors, hydrophobic zeolitic imidazolate framework-8 (ZIF-8) covered chemisorbed-oxygen-nonexistence zinc hydroxyfluoride (ZnOHF) snowflake-like nanorod bundles are synthesized for NO 2 detections with non-hindrance of interfering gases and high humidity in our work. Gas-sensing testing results display that the 0.6ZIF-8/ZnOHF-based gas sensor provides an optimum NO 2 response of 12.1–10 ppm NO 2 at the operating temperature of 200 ℃ with excellent NO 2 selectivity. As the relative humidity (RH) increases from 20% RH to 80% RH, the response of the 0.6ZIF-8/ZnOHF sensor shows a marginal fluctuation of only 13%, exhibiting outstanding anti-humidity characteristics towards NO 2 detections, the outperformed NO 2 selectivity and humidity tolerance of which are greatly attributed to the unique band structures of ZnOHF and the surficial hydrophobic treatment by ZIF-8, which is further validated via In-situ diffuse reflection infrared Fourier transform spectroscopy ( In-situ DRIFTS) and electronic structure analyses. Humidity impact on ZnOHF poses a persuasive evidence for establishing the separate physiosorbed water interfering mechanism on semiconductors. This work endows a perspective on optimizing humidity tolerance for semiconductor-based sensors at low operating temperature.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Zhijia Liao,Ninghao Chu,Zhenyu Yuan,Renze Zhang,Hongmin Zhu,Yanbai Shen,Fanli Meng
The novel copper hydroxyfluoride-copper oxide (CHFCO)/zinc hydroxyfluoride-zinc oxide (ZHFZO) nanomaterials were prepared by hydrothermal method and exhibited superior sensing performance for methamphetamine analogue-phenethylamine. The sensing characteristics of calcined ZHFZO rods, CHFCO flakes, and four composite nanomaterial ratios were examined. The experimental results demonstrated that the CHFCO/ZHFZO-2 sensor exhibited improved sensing performance for phenethylamine, with the optimum working temperature reduced to 200 ℃. The responses of the ZHFZO and CHFCO sensors to 10 ppm phenylethylamine were 1.9 and 3.5, respectively, while the response of the CHFCO/ZHFZO-2 sensor was enhanced to 5. With a response time (T res ) and recovery time (T rec ) of 30 s for 10 ppm phenylethylamine, the sensor enables rapid detection. It has great selectivity and reproducibility for phenylethylamine and can detect concentrations as low as 125 ppb, demonstrating its potential for quantitative detection at the parts per billion (ppb) level. The prepared composites possessed unique nanostructures and large specific surface areas . The substitution of fluoride ions produces a large electronegativity and the physical adsorption of polar hydroxyl bonds combine to enhance the sensitization of phenylethylamine gas. The findings presented in this study underscore the promising potential of the synthesized nanomaterials for highly sensitive and selective detection of phenylethylamine.
研究领域:
材料科学
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化学传感器
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药物检测
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产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2021
·
IF 6.165
Yingying Guo,Yuxuan Mo,Miao Wang,Huihui Cui,Yanfeng Tang,Tongming Sun
Employing DL-Alanine (DL-Ala) as the structure-directing agent, hierarchical microspheres of ZnOHF have been designed with optimized geometric features in a facile one-step hydrothermal approach. Morphological characterizations demonstrated that the obtained hierarchical microspheres were formed by numerous nanotubes with outer diameter of 10 nm and wall thickness about 3.5 nm. A series of controllable experiments proved that DL-Ala and reaction time played vital roles in the formation of nanotubes-assembled hierarchical microspheres. By taking advantage of the optimized geometric features and large specific surface areas (271.06 m 2 /g), the obtained ZnOHF nanotubes-assembled microspheres were evaluated as adsorbents for the removal of various dyes in aqueous solution. Adsorption behavior conducted by batch mode experiments indicated that the adsorption was well described by Langmuir isotherm and pseudo-second-order model. The obtained hierarchical ZnOHF microspheres exhibited effective adsorption and selectively properties towards cationic dyes. For example, the maximum adsorption capacity of ZnOHF microspheres was 140.4 mg/g for malachite green (MG) at 298 K. Analysis of thermodynamic data suggested that it was an endothermic and spontaneous physical adsorption process. The fabrication strategy may provide new insights for designing other high-performance materials, and the novel hierarchical ZnOHF microspheres are promising adsorbents for wastewater purification.
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
危险品化学品经营许可证（带存储）