SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Yiqun Zhang,Chong Wang,Fengmin Liu,Xiaoying Sun,Xinhao Guo,Lianjing Zhao,Geyu Lu
In recent years, researchers have discovered that self-assembled monolayer functionalized surfaces could improve the gas-sensing performance of semiconductor oxide-based sensors. In the present work, metal-organic framework material ZIF-8 was selected as the self-sacrificial template, and then ZIF-8 materials were calcined at a high temperature to obtain ZnO nanoparticles . Subsequently, the surface of ZnO was modified to install a single layer of 3-aminopropyltriethoxysilane (APTES). In comparison with the pure ZnO-based sensor, the sensor based on 0.5 vol% APTES/ZnO had higher response to 2-butanone. The response has remarkably improved mainly due to APTES molecules capture electrons from the surface of ZnO to widen the electron depletion layer . In addition, the amine (–NH 2 ) group of the APTES monolayer enhanced the specific interaction between the sensing material and 2-butanone, thereby the performance of the sensor was improved. After functionalization with 0.5 vol% APTES, the lower detection limit of the sensor reached as low as 200 ppb, while that of the pure ZnO-based sensor was 500 ppb.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Long Chen,Yanhua Song,Wenxin Liu,Hao Dong,Di Wang,Jun Liu,Qingjun Liu,Xing Chen
Gas sensors fabricated by metal oxide semiconductors (SMOs) exhibited promising prospect for acetone detection due to their high sensitivity, small sizes, simple operation, facile fabrication and low cost. However, the current SMOs still face diverse challenges involving high power consumption, low response, poor anti-interfering ability and weak repeatability. In this work, in order to meet the ever-increasing requirements for acetone detection, Pt nanoparticles (NPs) were embedded into ZIF-8 templates then loaded on porous SnO 2 nanofibers (NFs) via electrospinning and subsequent annealing process with a control of heating rate. The gas sensing characteristics of pristine SnO 2 , SnO 2 -ZnO, and Pt-ZnO-SnO 2 porous NFs were investigated. The Pt-ZnO-SnO 2 porous NFs displayed an ultrahigh response (R a /R g = 104.26–100 ppm at 170 °C), high selectivity and low detection limit (200 ppb) to acetone during dynamic measurements. In this study, the advanced sensing behavior can be ascribed to the multi-heterojunctions construction at the interface of SnO 2 -ZnO, ZnO/PtO 2 and SnO 2 /PtO 2 , the increasement of oxygen vacancies , as well as the electronic and chemical sensitization of Pt NPs. The well-dispersed and ultrasmall-sized Pt NPs (~3 nm) functionalized on porous SnO 2 NFs also play an essential role in fabricating high-performance acetone sensors.
研究领域:
材料科学
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纳米技术
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化学传感器
·
气体传感
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2016
·Vol. 27
·期 11
·11262-11267
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IF 1.798
Guo Xuexin,Zhang Jinbao,Ni Mucui,Liu Li,Lian Hongwei,Wang Han
Hollow and porous α-Fe 2 O 3 nanotubes were successfully synthesized by single nozzle electrospinning method followed by annealing treatment. The crystal structures and morphologies of the as-prepared materials were characterized by X-ray diffraction and scanning electron microscopy, respectively. The as-prepared materials were applied to construct gas sensor devices which gas sensing properties were further investigated. The obtained results revealed that porous α-Fe 2 O 3 nanotube gas sensors exhibit a markedly enhanced gas sensing performance compared with hollow α-Fe 2 O 3 nanotube gas sensors, which was about three times higher to 100 ppm acetone at 240 °C. Interestingly, hollow and porous α-Fe 2 O 3 nanotube gas sensors both showed fast response–recovery time and good selectivity, but the porous ones possessed the shorter recovery time. The improved properties could be attributed to the unique morphology of porous nanotubes. Thus, further improvement of performance in metal-oxide-semiconductors materials could be realized by preparation the unique porous structures of nanotubes. Moreover, it is expected that porous metal-oxide-semiconductors nanotubes could be further design as promising candidates for gas sensing materials.
研究领域:
材料科学
·
传感器技术
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DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
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2019
·
IF 3.858
Wei-Qi Xie,Yi-Xian Gong,Kong-Xian Yu
A fast, convenient and commercially available approach for analyzing humic acid content in fertilizer using headspace gas chromatography (HS-GC) is presented in this paper. Humic acid is converted into carbon dioxide based on the oxidation of humic acid in strong acidic medium and can be measured via automatic HS-GC. Conditions for the alkaline extraction and the humic acid oxidation process are also optimized. The new technique proved to be precise (RSD ≤ 3.59%) and accurate (relative errors≤9.46% as compared with the spectrophotometric approach). The newly established technique presents a practical tool to routinely analyze humic acid content in fertilizer during the fertilizer production.
研究领域:
分析化学
·
农业科学
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DOI
高影响因子
Reaction Chemistry & Engineering
·
2020
·Vol. 5
·期 9
·1751-1758
·
IF 3.441
Xiaonan Duan,Jiacheng Tu,Andrew R. Teixeira,Le Sang,Klavs F. Jensen,Jisong Zhang
An automated flow platform based on a tube-in-tube contactor and micro-packed bed reactor is developed to measure the kinetics of gas–liquid–solid hydrogenation reactions. The liquid flowing in the inner tube of the tube-in-tube contactor is rapidly saturated to ensure a constant H2 concentration before entering the micro-packed bed, which transforms the gas–liquid–solid system into a liquid–solid system. A ramping strategy is adopted in which the continuously varied residence time and the corresponding conversion data are obtained in a single experiment. Two reactions including hydrogenation of α-methylstyrene and nitrobenzene are chosen to demonstrate the accuracy and efficiency of this automated platform. Varying the flow rate ramping shows that accurate kinetic determination requires a specific range of flow rate ramps. A kinetic curve of conversion versus residence time (more than ten thousand data points) can be obtained in a single experiment within 50 min. The kinetic parameters obtained with this strategy agree well with literature values. The automated flow platform with flow rate ramping enables accurate determination of gas–liquid–solid reaction kinetics with higher efficiency and lower reagent cost compared with other methods.
研究领域:
化学工程
·
反应动力学
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DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2020
·
IF 2.369
Qiang Wang,Qiang Wang
The dispersive component of surface energy (γsd) and Lewis surface acid–base parameters (Ka, Kb) for phthalate plasticizers, including dimethyl phthalate, di-n-butyl phthalate, di-2-ethylhexyl phthalate, diisononyl phthalate, and diisodecyl phthalate, were determined by inverse gas chromatography (IGC) at infinite dilution. The IGC study was performed with an oven temperature varying between 313.15 and 343.15 K. Polar and nonpolar probes were used to quantify the solute–sorbent systems. Experimental data showed that the difference between the γsd values calculated by two methods (Schultz and Dorris and Gray) increases with increasing temperature. The acid–base parameters indicated that the surfaces of five examined phthalate plasticizers can be considered as amphoteric with a dominant basic character, and the Ka and Kb values ranged from 0.35 to 0.36 and 1.20 to 1.25, respectively. It was also found that the γsd value increased and the Lewis surface basicity (Kb/Ka) decreased with an increase of the alkyl chain length grafted onto the plasticizers. It is confirmed that IGC was useful for surface characterization and can be used to provide instructive thermodynamic information over a wide temperature range.
研究领域:
材料科学
·
物理化学
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DOI
高影响因子
Reaction Chemistry & Engineering
·
2019
·Vol. 4
·期 4
·715-723
·
IF 3.935
Hao Feng,Xun Zhu,Biao Zhang,Rong Chen,Qiang Liao,Dingding Ye,Jian Liu,Ming Liu,Gang Chen,Kun Wang
The hydrodynamic characteristics of gas–liquid two-phase flow can significantly affect the performance of gas–liquid–solid microreactors. Using nitrobenzene hydrogenation as the reference heterogeneous catalytic reaction, the two-phase reacting flow behavior was visualized and characterized. Distinct differences in the length evolution, migration velocity and residence time of gas slugs were noticed for the reaction and non-reaction cases. The interface retraction of a gas slug was observed, which was mainly due to the hydrogen consumption at the gas pressure accumulation stage. Moreover, effects of the gas and liquid flow rates as well as the inlet nitrobenzene concentration on the two-phase flow behaviors and microreactor performance were also investigated. The results suggested that increasing the gas flow rate could enhance nitrobenzene conversion, but this effect was inhibited by the reduced residence time at high gas flow rates. Higher nitrobenzene concentration could enhance the interface retraction and extend the residence time, and together promote aniline production but in a trade-off with the conversion. This work reveals the intrinsic interaction between two-phase flow behaviors and catalytic reaction in microreactors, which can play a significant role in the development of microreactor technology.
研究领域:
化学工程
·
催化反应工程
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DOI
高影响因子
CHROMATOGRAPHIA
·
2018
·Vol. 81
·期 9
·1317-1323
·
IF 1.401
Zhang Chaozheng,Tang Ping,Xu Huijing,Weng Yanru,Tang Qiaoqiao,Zhao Hua
The level of short-chain fatty acids (SCFAs) is related to health benefits. In this study, a static headspace (HS) gas chromatography method was developed and validated for analyzing SCFAs in fecal samples. SCFAs were injected onto a column through an HS injector through an HS procedure and salting-out technology. The limits of detection and quantification (LOQ) of this method are 0.02–0.08 µg L − 1 (0.4–1.6 µg g − 1 sample) and 0.005–0.020 µg L − 1 (0.1–0.4 µg g − 1 sample), respectively. The calibration curves show good linearity over the range (LOQ–200 µg L − 1 or LOQ–4000 µg g − 1 sample) of these compounds, and the correlation coefficient is > 0.99. The recovery of the method is between 80 and 105%, and matrix effects were not observed. The proposed method was successfully applied to analyze SCFAs in fecal samples from rats. Graphical Abstract
研究领域:
分析化学
·
肠道微生物组学
·
营养学
✓ 已验证
DOI
高影响因子
Sensors and Actuators Reports
·
2026
·
IF 6.9
Zhifei Cao,Pengxia Li,Guowei Yang,Yifei Ma,Mei Wang,Suotang Jia,Xuyuan Chen,Zhaomin Tong
The applicability of conventional metal oxide semiconductor (MOS) gas sensors in wearable devices is limited by their rigid substrates and extra heat loss. In this study, we developed a wearable MOS gas sensor using flexible hollow glass microfiber as the heating and synthesizing substrate. SnO 2 was deposited in situ on the hollow glass microfiber surface through atomic layer deposition. Subsequently, after post annealing and applying a breathable composite protective layer, the developed O 2 sensor was integrated into clothing to demonstrate its wearability. At an optimal operating temperature of 280 °C, the sensor achieved responses of 35.4% and 33.2% to 10% O 2 before and after bending, while consuming only 285.1 mW of power.
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产品关联
DOI
高影响因子
Small
·
2026
·
IF 11.8
Zefang Dong,Jiaxin Bai,Guoxu Liu,Beibei Fan,Jie Cao,Ziyue Wang,Xianpeng Fu,Chi Zhang
Harvesting energy from dispersed water sources (e.g., rain, atmospheric moisture) offers a promising route for powering distributed low-power electronics. However, most existing water-enabled electric generators exploit only a single phase of water, overlooking their coexistence and causing inefficient utilization of the hydrological cycle energy. Here, inspired by the Janus wetting properties of lotus leaves, we present a liquid-gas dual-phase water energy harvester capable of simultaneously harvesting energy from liquid-phase and gas-phase water. This dual-function device features a hydrophobic top surface that converts the kinetic energy of water droplets into pulsed electricity, and a hydrophilic bottom surface embedded with ionic hydrogels that absorb moisture and convert moisture-induced ion-concentration gradients and electrochemical potentials into continuous electricity. With a maximum power density of 78.91 µW cm −2 , a 36 cm × 28 cm array can generate a continuous voltage of 8.2 V and a current of 5.6 mA, and additional transient voltage pulses up to 150 V and pulsed currents of 0.3 mA are superimposed under rainfall at 16.5 mm min −1 , sufficient to power a road lamp and mobile phones in real time. The coplanar-electrode design ensures favorable scalability, making it a promising solution for off-grid IoT deployments across water-rich remote or outdoor environments.
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产品关联
DOI
PubMed
高影响因子
ANALYTICAL CHEMISTRY
·
2026
·
IF 7.3
Huifeng Liu,Jing He,Zhihai Wu,Jian Wang,Yunyun Zhang,Mingxia Sun,Juanjuan Wang,Hongdeng Qiu,Xuwei Chen,Jia Chen
Compared with bulk crystal materials that have limitations such as high mass transfer resistance and insufficient exposure of surface action sites, the development of ultrathin two dimensional nanosheets is more attractive. Developing chiral stationary phases with both structural stability and high enantioselectivity remains a key challenge in this field. This study reported a chiral ionic organic single-crystal (BPDS-PBIM), which was constructed by the ionic self-assembly of 4,4′-biphenyldisulfonic acid (BPDS) and chiral ionic liquid (PBIM). Its distinct supramolecular environment with multiple chiral centers and unique molecular packing pattern was confirmed by single-crystal X-ray diffraction (SC-XRD, space group P21). Experiments showed that the stationary phase of 2D nanosheets, prepared by exfoliating BPDS-PBIM, exhibited exceptional separation performance for complex pharmaceutical molecules (e.g., ibuprofen, ketoprofen, flurbiprofen, fenoprofen, mexiletine hydrochloride) and chiral compounds with different polarity. This work not only demonstrates the powerful potential of BPDS-PBIM as a chiral stationary phase but also suggests its broad application prospects in fields such as pharmaceutical analysis, flavor and fragrance quality control, and chemical reaction monitoring.
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DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2026
·
IF 5.4
Haifeng Wang,Zhengsong Hu,Jie Xu,Chaoyang Li,Aokun Lin,Kunkun Zhu,Li Yu,Guanxiang Ma,Yuwen Liu,Haifeng Bao
Capturing gas bubbles in liquid is vital for the gas-liquid-solid (GLS) three-phase reactions due to the limited gas solubility. Constructing the special porous skeleton for bubble accommodation opens an opportunity to drag bubbles in liquid. Herein, mm-sized Pd-anchored cellulose/agarose (PCA) spheres with a highly porous architecture have been fabricated using a liquid nitrogen-freezing method. PCA particles could act as gas carrier to accommodate a variety of gas bubbles in liquid, including H 2 , O 2 , air, and CO 2 via an in-situ nucleation route. Moreover, these PCA beads enabled efficient multiphase catalysis as demonstrated by cascade reduction of a series of substances, such as aldehydes, nitroarenes, and alkenes. Their catalytic activities remarkably surpassed Pd-deposited solid glass spheres (PG) and sole Pd nanoparticles, manifesting the important role of their porous texture in gas harvesting and storage. A gas (H 2 ) utilization of 98.0 % was attained for multiphase reaction over PCA beads. During multiphase reaction process, a controllable motion of PCA spheres was achieved via gas reservation or consumption. This work provides a profound inspiration for bubble arresting and stabilization toward regulable movement and multiphase processes.
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）