ANALYTICAL CHEMISTRY
·
2025
·
IF 6.7
Yuming Tan,Bolang Cheng,Xiaocong Tang,Wei Zhao,Yong Zhang
The development of gas sensor chips with high sensitivity is essential for environmental monitoring and disease diagnosis. Traditional strategies for enhancing gas sensor performance, such as heat and light assistance, inevitably influence device integration due to the requirement of auxiliary heating/lighting modules. Herein, a method for adjusting the work function of sensing materials via an electric field is proposed, which allows ppb-level ammonia (NH3) detection and facilitates on-chip integration of gas sensors by eliminating the requirements of heating or irradiation. Based on this mechanism, a carbon-based field-effect transistor (FET) gas sensor with a dual-gate structure is designed, achieving a detection limit of 40 ppb NH3 at 25 °C under an optimized control gate (CG) voltage of −8 V. Through density functional theory (DFT) calculations and electronic structure analysis, we reveal that the sensing mechanism originates from CG’s work function variations induced by electric fields. Differential charge density calculations further indicate that the adsorption site, distance, and molecular polarization of NH3 are regulated by the applied electric field, leading to an optimal response at specific gate voltages. This work reveals the mechanism of the electric field on gas sensor performance, providing a novel and universal strategy for developing high-performance gas sensors compatible with on-chip integration.
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DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Xinxin Xing,Yue Yang,Zhiyong Yan,Ying Hu,Tong Zou,Zidong Wang,Yude Wang
In this work, CdO-Ag-ZnO nanocomposites with hierarchically porous structure and large surface area were successfully fabricated by solution combustion synthesis (SCS) method. Crystalline structure, morphology, surface chemical states and specific surface area were investigated by XRD , SEM, TEM, XPS and BET techniques, respectively. Sensors fabricated from CdO-Ag-ZnO nanocomposites were made based on indirect heating method, which showed superior sensing properties in detecting different concentration of volatile organic compounds (VOCs). In contrast with singular ZnO, gas-sensing experiment results reveal that the addition of CdO and Ag effectively decreases optimum working temperature, increases gas response value and shortens response and recovery time. What’s more, other gas-sensing properties including repeatability, sensitivity and long-term stability are also discussed in this research. Particularly, gas sensor based on 10 mol% CdO-Ag-ZnO shows modest gas-sensing performance to VOCs at the operating temperature of 200 °C, and its gas response values are 198.63, 156.07, 53.04, 64.23, 183.65 towards 100 ppm formaldehyde, ethanol, acetone, methanol and isopropanol, respectively, indicating it a promising candidate in detecting VOCs. Superior sensing property is mainly ascribed to large specific surface area, special porous surface morphology, unique combination of nanocomposites and good catalytic ability of metallic Ag.
研究领域:
材料科学
·
纳米技术
·
气体传感
·
环境监测
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DOI
高影响因子
Journal of Environmental Sciences
·
2020
·
IF 4.302
Junxiang Guo,Yuran Li,Jin Xiong,Tingyu Zhu
To clarify the effect of coking dust, sintering dust and fly ash on the activity of activated carbon for various industrial flue gas desulfurization and denitrification, the coupling mechanism of the mixed activated carbon and dust was investigated to provide theoretical reference for the stable operation. The results show that coking dust had 34% desulfurization efficiency and 10% denitrification efficiency; correspondingly, sintering dust and fly ash had no obvious desulfurization and denitrification activities. For the mixture of activated carbon and dust, the coking dust reduced the desulfurization and denitrification efficiencies by blocking the pores of activated carbon, and its inhibiting effect on activated carbon was larger than its own desulfurization and denitrification activity. The sintering dust also reduced the desulfurization efficiency on the activated carbon while enhancing the denitrification efficiency. Fly ash blocked the pores of activated carbon and reduced its reaction activity. The reaction activity of coking dust mainly came from the surface functional groups, similar to that of activated carbon. The reaction activity of sintering dust mainly came from the oxidative property of Fe 2 O 3 , which oxidized NO to NO 2 and promoted the fast selectively catalytic reduction (SCR) of NO to form N 2 . Sintering dust was activated by the joint action of activated carbon, and both had a coupling function. Sintering dust enhanced the adsorption and oxidation of NO, and activated carbon further promoted the reduction of NO x by NH 3 ; thus, the denitrification efficiency increased by 5%-7% on the activated carbon.
研究领域:
环境科学
·
化学工程
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DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Birou Huang,Chong Lei,Xiaoming Sun,Liang Luo,Gongwei Wang,Lin Zhuang,Li Xiao
For tight assembly electrochemical gas evolution devices, such as anion exchange membrane water electrolysis (AEMWE), bubbles blocking gas diffusion layer (GDL) channels is one of the key reasons for cell performance degradation under high current densities . To enhance mass transport in GDLs at high current densities, herein we report a 3D printed Ni GDL (GDL 3D print ) with straight-through pores and three-dimensional periodic structures . Due to its periodic structures and high hydrophilicity , GDL 3D print is more conducive to the rapid escape of bubbles and timely replenishment of water, showing higher mass transfer efficiency and lower ohmic resistance . Therefore, compared with the commercial nickel foam (NF), GDL 3D print exhibits better cell performance not only in 1 mol/L KOH solutions but also in pure-water-fed AEMWE, and the cell voltage of AEMWE using GDL 3D print as the anode GDL is only 1.8 V at 1 A cm −2 . This work provides a useful guidance for GDL design for tight assembly electrochemical gas evolution devices.
研究领域:
材料科学
·
电化学工程
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Di Liu,Zilong Tang,Zhongtai Zhang
SnS 2 is a promising candidate for NO 2 sensing applications due to its suitable band gap and large electronegativity. However, SnS 2 based gas sensors are still restricted to detect NO 2 gas at room temperature due to their giant resistance and poor recovery. Here, we report hollow SnO 2 @SnS 2 nanostructures prepared by a one-step hydrothermal method. The SnO 2 @SnS 2 based sensor showed high response and good recovery to ppb-level NO 2 under visible illumination at room temperature (25 °C). The superior sensing performance of the SnO 2 @SnS 2 sensor was attributed to the hollow porous heterojunction structure beneficial for gas diffusion, as well as visible light assistant facilitating charge transfer and gas desorption. This work systematically studied the influence of oxygen concentration in background gas on the NO 2 sensing performance of the SnO 2 @SnS 2 sensor, and proposed a physical adsorption model for the NO 2 sensing mechanism of the SnO 2 @SnS 2 sensor under visible light at room temperature. In addition, the effect of humidity on the gas sensing performance of the SnO 2 @SnS 2 sensor to different concentrations of NO 2 was also discussed.
研究领域:
材料科学
·
环境科学
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DOI
高影响因子
FIBERS AND POLYMERS
·
2025
·
IF 2.3
Shan Chao,Mo Junhao,Wu Shanshan,Qu Junjie,Liu Chanjuan,Sun Xiaoyi,Huang Xiaohua
A series of fluorinated copolyimides containing non-coplanar triphenylamine (TPA) units was synthesized from 4,4′-diamino-3′′,5′′-difluorotriphenylamine (DMTPA), 4,4′-oxydianiline (ODA), and 4,4′-(hexafluoroisopropylidene)diphthalic anhydride (6FDA) through high-temperature polycondensation. The resulting copolyimides exhibited high thermal stability, good solubility in common organic solvents, optical transparency, and enhanced hydrophobicity. Wide-angle X-ray diffraction (WAXD) and molecular simulations confirmed that the bulky fluorinated TPA units increased interchain spacing and fractional free volume (FFV), thereby facilitating gas transport. Gas permeation measurements at 35 °C and 4 bar revealed that CO 2 permeability increased with TPA content, whereas CO 2 /N 2 selectivity remained nearly constant (~ 21). The best-performing membrane (DFPI-5) achieved a CO 2 permeability of 24.93 Barrer with a CO 2 /N 2 selectivity of 21.31, approaching the 2008 Robeson upper bound. These findings underscore the effectiveness of fluorinated, non-coplanar TPA moieties in tailoring polyimide membranes for advanced gas separation.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Feipeng Wang,Kelin Hu,Hongcheng Liu,Qi Zhao,Kaizheng Wang,Yuxin Zhang
In this work, we introduced a structure of Pd coated SnO 2 nanofiber rods (NFRs) prepared by electrospinning and magnet sputtering. Pd was first deposited on the obtained nanofibers as a catalyst and then fully dispersed during the resulting of SnO 2 to improve the hydrogen response. The gas sensing tests showed the palladium enhanced the hydrogen response at low temperature (160 °C). When the hydrogen gas concentration was 100 ppm, the limit of detection (LOD) of sensor was as low as 0.25 ppm and the response time was as short as 4 s. Moreover, Pd coated SnO 2 also had excellent hydrogen selectivity and repeatability. The gas sensor was suitable for the detection of hydrogen in low-temperature environment. This work provided a new method for the low temperature hydrogen gas sensor with a fast response and low LOD .
研究领域:
材料科学
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传感器技术
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纳米材料
·
气体传感
·
功能材料
·
电纺丝技术
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DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 7
·3680-3685
·
IF 3.108
Hua-Yao Li,Liang Huang,Xiao-Xue Wang,Chul-Soon Lee,Ji-Wook Yoon,Jun Zhou,Xin Guo,Jong-Heun Lee
A free-standing, flexible, and semi-transparent MoO3 nanopaper was fabricated using ultralong MoO3 nanobelts (length ∼ 200 μm; width 200–400 nm), and its gas-sensing characteristics were investigated. The sensor exhibited high responses (resistance ratio) of 49 to 5 parts per million (ppm) hydrogen sulfide (H2S) at 250 °C and 121 to 5 ppm trimethylamine (TMA) at 325 °C with excellent gas selectivity, demonstrating its dual function for gas detection. Moreover, the sensor showed promising potential for the all-in-one detection of three representative offensive odors (TMA, H2S, and NH3) simply by tuning of the sensing temperature. This particular performance is attributed to the high chemical affinity of MoO3 to H2S and the acid–base interaction between basic TMA/NH3 and acidic MoO3. The mechanism underlying the control of gas selectivity by modulating the sensor temperature was investigated by Diffuse Reflectance Infrared Fourier Transform (DRIFT) measurements.
研究领域:
材料科学
·
纳米科技
·
传感器技术
·
分析化学
·
环境监测
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DOI
高影响因子
ADSORPTION-JOURNAL OF THE INTERNATIONAL ADSORPTION SOCIETY
·
2024
·Vol. 30
·期 3
·377-387
·
IF 3
Ma Yuling,Li Airong,Wang Zhihong,Wang Cheng
There is an urgent need to address sulfur dioxide (SO 2 ) from the burning of fossil fuels, which poses a serious hazard to the surrounding environment due to its emission. In this work, UiO-66-type metal–organic framework materials (MOFs) were prepared by hydrothermal method and applied to flue gas desulfurization. Through characterization analysis, it was found that UiO-66 sample had high crystallinity and good thermal stability. Besides, UiO-66 sample had a large specific surface area (1423 m 2 /g) and a large pore volume (0.69 cm 3 /g). In the desulfurization experiments of SO 2 /CO 2 /O 2 /N 2 gas mixture (0.3/10.0/5.5/84.2 vol.%), UiO-66 had a breakthrough time of 137.6 min/g for SO 2 , the high selectivity of SO 2 /CO 2 (36.0), and strong acid resistance. Besides, the adsorption thermodynamic analysis can confirm that the adsorption process of UiO-66 for SO 2 was a combination of physical adsorption and chemical adsorption. At 1.0 bar and 298 K, the adsorption capacity of SO 2 on UiO-66 reached 8.12 mmol/g.
研究领域:
环境科学
·
材料科学
·
化学工程
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 9
·6168-6177
·
IF 2.779
Chen Pu,Zhao Zhihua,Shao Zhigang,Tian Ye,Li Bo,Huang Bo,Zhang Shuaiwen,Liu Chunbo,Shen Xiaoqing
Semiconducting nanomaterials with different sizes and shapes have wide applications in the field of electronics, and one of the key pathway to improve their performance is by recombination of different materials. In our innovative work, the nanocomposites of polypyrrole (PPy) and MXene were prepared by a simple in situ polymerization reaction. The samples were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS). The samples were made into sensors, and the gas sensitivities of the materials were investigated under different test conditions. The results showed that the response value of PPy/MXene-12 sensor to 100 ppm ammonia at room temperature was 2.38 times than that of pure PPy and 6.38 times than that of pure MXene. In addition, the sensor has excellent selectivity and low detection limit, which demonstrate the excellent practicability of them in the field of Internet of Things (IoT).
研究领域:
材料科学
·
电子工程
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Lu Wang,Ying Li,Liming Pu,Miao Yang,Hongsheng Lu,Xuehong Gu,Xuerui Wang
Helium extraction from natural gas is energy extensive since >95% feed stream needs to be liquefied in multi-cycles. Membrane gas separation is an energy-efficient alternative because of room temperature operation and no phase change. However, the practical application is significantly retarded by the limited permeation flux, which is mainly attributed to the thick selective layer. Herein, asymmetric 6FDA-APAF 0.5 -Cardo 0.5 copolyimide membranes with effective thickness of ∼ 200 nm were prepared by the one-step phase inversion method. The He permeance reached up to 120 GPU, one order magnitude higher than that of the free-standing one. The selectivity was 44 for He/N 2 and 67 for He/CH 4 binary mixtures. The performance surpassed 2019 upper bound and the benchmark membranes for He separation from N 2 or CH 4 . Meanwhile, the performance is resistant to the impurities of C 2 H 6 and CO 2 in the natural gas. Together with long-term stability (>200 h), the thin 6FDA-APAF 0.5 -Cardo 0.5 membrane would pave the way to He extraction from natural gas for practical application.
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DOI
高影响因子
FUEL
·
2023
·
IF 7.4
Chunlong Jiang,Haobo Bi,Zhanshi Ni,Hao Sun,Hao Shi,Qizhao Lin
Aluminum was extensively used in aerospace and other industries. It is a clean fuel with a high energy density that is simple to store and transport. However, the presence of oxide caps on the surface impedes the combustion of aluminum powder. The combustion process of nano-aluminum in different atmospheres and temperatures was studied in this paper using thermogravimetric analysis and a combustion experiment platform. It was discovered that there is no discernible difference in the combustion process of nAl in the air and CO 2 atmospheres under the temperature programmed condition. The combustion process was divided into three stages at the time, with the oxidation process concentrating primarily in the second and third stages. The activation energy showed a change law of first rising, then falling, and then rising at various stages. It was discovered that the combustion process under 20% oxygen concentration was similar to that under CO 2 atmosphere by comparing the combustion experiments under different oxygen concentrations and CO 2 atmosphere. The greater the concentration of oxygen, the better the combustion effect. The ignition delay time was greatly reduced as the ambient temperature increased from 900 °C to 1000 °C. 900 °C can be regarded as the critical value of nano-aluminum combustion in two gas atmospheres. The combustion product was detected using XRD, and the content of α-Al 2 O 3 increased with increasing temperature.
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高影响因子
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