ACS Sensors
·
2020
·
IF 7.333
Hui Zhi,Jianmei Gao,Liang Feng
In this study, an innovative gas sensing mechanism, self-responsive sensing mechanism, has been detected in the supramolecular hydrogel-based sensors. The self-responsive ability of as-fabricated hydrogel-based sensors to the target gas (e.g., NO2, NH3, etc.) is determined by three synergetic supramolecular interactions, namely, hydrogen bonding, molecule crystallization, and electrostatic interactions existing in hydroxyls, poly(vinyl alcohol) (PVA) crystallization, and poly(ionic liquids) of the intrinsic hydrogel networks, respectively. On account of unique synergetic supramolecular interactions, the sensors not only exhibit a rapid, reversible, and reproducible response but also show good tensile and compressive properties and excellent recovery property. The results demonstrate the potential of the self-responsive sensing mechanism as a pathway to realize a new generation of highly responsive hydrogel-based gas sensors.
研究领域:
材料科学
·
化学传感器
·
超分子化学
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产品关联
DOI
PubMed
高影响因子
Frontiers in Environmental Science
·
2024
·
IF 3.3
Zhao Yilong,Liu Chengwei,Tu Xiang,Huang Wenkai,Liu Yu,Fu Hongbo
Field observations have confirmed that halide ions are widely distributed among aerosols from the marine boundary layer and on the surfaces of ice and snow in polar regions. Consequently, the coexistence of halide ions may play a more significant role in nitrate photolysis than previously thought. In this study, we simultaneously measured HONO, NO2, and NO2− in situ to gain a deeper understanding of the coexisting system, including the photogenerated nitrogen products and the effects on nitrate photolysis rates due to enhanced aqueous nitrite and HONO transfer rates by halides. The presence of halides significantly increased the photogenerated nitrogen products across various molar ratios ([X–]/[NO3−]) at pH 3.5. By eliminating oxygen flux, the transformation of the primary photogenerated products was affected, resulting in higher concentrations of N(III) as both HONO and NO2−. Experiments involving OH scavengers indicated that the attack from·OH initiated by halides leads to side reactions that enhance nitrate photolysis. Both theoretical calculations and nitrate actinometry were used to determine the photolysis rate of nitrate solutions, which together indicated that the presence of halides enhances nitrate photolysis. A newly developed model was used to determine the HONO transfer rate, finding that the presence of halides ([X–]/[NO3−] = 0.2) enhanced the evaporation of N(III) in solution by factors of 0.68, 0.95, and 1.27 for Cl−, Br−, and I−, respectively. To our knowledge, this is the first determination of halide effects on the mass transfer of HONO. The enhanced nitrate photolysis rate can be attributed to the differential surface effects of halides and parallel reactions initiated via ·OH stemming from nitrate photolysis, with varying rates leading to different quantities of nitrogenous products. Additionally, simultaneous measurements of photoproducts in both gas and condensed phases are recommended to better constrain the rate constants of NO3− photolysis.
研究领域:
环境科学
·
大气化学
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DOI
高影响因子
INORGANICA CHIMICA ACTA
·
2021
·
IF 2.545
Wenting Chen,Hua Liang,Xin Wen,Zongchen Li,Hui Xiong,Qiang Tian,Minhao Yan,Yuanzhi Tan,Guy Royal
To explore the effect of sensor structure on anions detection, three new hydrazones P-CN , P-CF 3 and P-NO 2 having different electron-withdraw groups are synthesized. Their anions recognition properties are investigated compared with those of P-OMe , P-H and acylhydrazone B-NO 2 . It shows all non-nitro hydrazones exhibit increasing sensitivity specifically toward CN − in the order of P-OMe < P-H < P-CN < P-CF 3 , indicated by color change from colorless to different shades of blue. Whereas P-NO 2 responds to CN − , F − and H 2 PO 4 − concurrently and its sensitivity to CN − is more than 4 times higher compared with that of the other hydrazones. CN − can be discriminated from F − by P-NO 2 in acetonitrile/water. On the other hand, B-NO 2 has only discernible response to CN − and F − with less sensitivity than P-NO 2 does. Detection details of P-NO 2 to CN − are investigated by titration, anti-interference tests, Job’s plot, HRMS, pH effect assays. The 1 H NMR, IR and reversibility tests demonstrate the deprotonation mechanism. The detection mechanisms of P-NO 2 and B-NO 2 to CN − are compared and demonstrate the reason of their recognition difference. The detection limits of P-NO 2 to CN − , F − and H 2 PO 4 − in acetonitrile are 0.0477 μM, 0.0876 μM and 1.46 μM, respectively. Hence, this work indicates that strong electron-withdraw group in related probes can improve their anion detection ability, meanwhile conjugation effect should be also considered in structure designing.
研究领域:
分析化学
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材料科学
·
化学传感器
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2026
·
IF 4.6
Liang Guangling,Dong Wanqi,Lin Yuan,Yu Xiaoqing,Xu Gang,Wang Guane
Heterojunction materials achieve efficient charge transfer
and
carrier separation through built-in- electric fields at the interfaces,
thereby substantially enhancing the sensitivity and selectivity of
gas sensors. However, traditional particle-contact heterojunctions
suffer from discontinuous interfaces and limited contact areas, resulting
in low charge transport efficiency and restricted gas-sensing performance.
Herein, we construct two intramolecular D–A heterostructured
frameworks (CuBr-CuMND and CuI-CuMND) by directionally linking CuX
chains (donor) and CuMND (acceptor) via Cu–S coordination bonds.
The atomically continuous heterointerface achieves spatial highest
occupied molecular orbital/lowest unoccupied molecular orbital separation
and a strong internal built-in electric field (IEF). CuI-CuMND exhibits
a record-low detection limit of 0.05 ppb and a response of 1315% toward
10 ppm of NO 2 , along with excellent long-term stability
at room temperature without light assistance. Theoretical calculations
reveal that, compared with CuBr-CuMND, CuI-CuMND exhibits a larger
Fermi level disparity, which generates a stronger IEF that significantly
enhances interfacial charge separation and transport, ultimately leading
to a higher response value and faster response/recovery time toward
NO 2 . This study establishes a molecular-scale intramolecular
heterojunction engineering strategy for room-temperature trace-gas
sensing.
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Jiamin Wu,Qian Tian,Yi Liu,Maoping Xu,Shengxiang Gao,Anran Ma,Chuang Hou,Guoan Tai
Developing room-temperature gas sensors with ultrahigh sensitivity and rapid response to nitrogen dioxide (NO 2 ), a hazardous air pollutant, remains critically important yet challenging. Borophene, a two-dimensional (2D) elemental nanomaterial, exhibits promising sensing potential owing to its exceptional electronic conductivity and abundant active surface sites. However, pristine borophene suffers from limited response kinetics and diminished sensitivity at elevated NO 2 concentrations. Herein, we introduce a novel heterostructure composed of lead sulfide (PbS) nanoparticles decorated on α'-4H-borophene nanosheets, synthesized through a facile ultrasound-assisted assembly strategy. The resultant borophene-PbS composite demonstrates outstanding sensing performance, exhibiting a remarkable sensitivity of 1692 % at 75 ppm NO 2 , an ultrafast response (<10 s), and an exceptionally low detection limit of 20 ppb at ambient conditions. Comprehensive structural and mechanistic analyses reveal that synergistic interfacial coupling between borophene and PbS significantly enhances NO 2 adsorption and accelerates interfacial charge transfer dynamics. This work not only overcomes intrinsic limitations of pristine borophene but also establishes a scalable approach toward next-generation 2D-based gas sensors with superior sensitivity, selectivity and stability.
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2013
·
IF 5.695
Ruixue Wang,Geli Li,Yongqiang Dong,Yuwu Chi,Guonan Chen
Silica aerogels functionalized with strongly fluorescent carbon quantum dots were first prepared and used for simple, sensitive, and selective sensing of NO2 gas. In the presence of ethanol, homemade silica aerogels with a large specific surface area of 801.17 m2/g were functionalized with branched polyethylenimine-capped quantum dots (BPEI-CQDs) with fluorescence quantum yield higher than 40%. The prepared porous CQD-aerogel hybrid material could maintain its excellent fluorescence (FL) activity in its solid state. The FL of CQD-aerogel hybrid material could be selectively and sensitively quenched by NO2 gas, suggesting a promising application of the new FL-functionalized aerogels in gas sensing.
研究领域:
材料科学
·
环境科学
·
化学
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产品关联
DOI
PubMed
高影响因子
Journal of Physical Chemistry C
·
2021
·
IF 4.126
Tamara Russ,Zhixiang Hu,Benjamin Junker,Huan Liu,Udo Weimar,Nicolae Barsan
Lead sulfide (PbS) is a p-type semiconductor that is often applied in photodetectors and solar cells. One major problem that researchers are regularly confronted with is the loss of performance when operated in air. The sensitivity to the ambient, however, makes it an interesting material for the application in gas sensors. Although a lot of research has been focused on the aging of PbS, the influencing factors and the associated material changes are still a matter of debate. Resistance measurements of differently prepared PbS samples operated as sensors for the detection of NO2 (a strongly oxidative gas) in combination with surface-sensitive methods (diffuse reflectance infrared Fourier transform spectroscopy and X-ray photoelectron spectroscopy) enabled the investigation of the changes associated with aging and their influence on the sensing mechanism. The aging mechanism was found to be predominantly influenced by the presence of residuals of the stabilizing agent oleic acid that was adsorbed at the surface of the colloidal quantum dots. Additionally, it was found that a byproduct of the consumption of oleic acid enhanced the detected sensor signal.
研究领域:
材料科学
·
表面化学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2026
·
IF 9.1
Wenjie He,Jiazhen Liao,Lin Jing,Xiao Zhang,Rong Xiao,Peng Chen,Xing'an Dong,Wendong Zhang,Yan Zou,Yuechang Wei
Herein, Br − and Bi 0 co-modified Bi 2 WO 6-x nanosheets were synthesized for efficient photocatalytic NO removal. Plasmonic metallic Bi 0 markedly enhanced visible light absorption, and the Br − -Bi 0 synergistic interaction facilitated efficient separation and migration of photogenerated carriers. Consequently, the optimal catalyst achieved a maximum visible-light-driven NO removal efficiency of 53.1% with near-zero toxic NO 2 accumulation, significantly outperforming pristine Bi 2 WO 6-x (4.6%). Quenching experiments reveal that NO activation and oxidation are dominated by photogenerated e − and •O 2 − radicals, while photogenerated h + drives the subsequent deep oxidation of NO 2 . In-situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) combined with density functional theory (DFT) calculations confirm the coexistence of direct (NO → NO − → NO 3 − ) and indirect (NO → NO 2 − → NO 3 − ) NO deep oxidation pathways. The Br − -Bi 0 synergy promotes the NO 2 − -to-NO 3 − step, effectively suppressing toxic NO 2 accumulation. This work provides mechanistic insights into the design of advanced photocatalysts for safe and efficient atmospheric pollutant purification.
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Wiewei Meng,Ling Wang,Yuehua Li,Huizhu Zhou,Zhangxing He,Wei Meng,Lei Dai
CoWO 4 -PdO dual phase composites were successfully prepared by self-demixing of the precursor CoPd x WO 4+x (x = 0, 2%, 5%, 10%) calcined at 800 °C and used as sensing electrodes for mixed-potential type NH 3 sensors based on yttria stabilized-zirconia (YSZ) electrolyte. The materials were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and Field-emission scanning electron microscopy (FESEM), respectively. NH 3 response performance of the sensors to different concentrations of NH 3 (20–300 ppm) was evaluated at 350–500 °C. It was found that the sensors attached with CoWO 4 -PdO sensing electrode are much more sensitive to NH 3 than the CoWO 4 -based sensor. Among them, CoWO 4 -5%PdO based sensor gives the highest sensitivity (−76.8 mV/decade at 400 °C), the response signals (Δ V ) of the sensor vary linearly with the logarithm of the NH 3 concentrations in the range of 50–300 ppm at a given temperature. The sensor also exhibits well reproducibility, stability and long-term stability. Furthermore, compared with CoWO 4 -based sensor, the introduction of PdO in CoWO 4 makes the interference of NO 2 on the sensor significantly reduced from 100% to 50%, which is attributed to the fact that the second phase PdO depresses the adsorption of NO 2 .
研究领域:
材料科学
·
传感技术
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2013
·
IF 3.535
Zhenyu Wang,Peng Sun,Tianlin Yang,Yuan Gao,Xiaowei Li,Geyu Lu,Yu Du
The flower-like WO 3 structures were successfully synthesized by a simple calcination of W 18 O 49 nanowires obtained by a microwave-assisted solvothermal method . The as-prepared products were characterized by field emission scanning electron microscopy , X-ray powder diffraction, transmission electron microscopy , and nitrogen adsorption and desorption measurements. The results indicated that the building blocks of the flower-like structure were intercrossing single crystalline WO 3 nanorods with diameter of about 30–40 nm and length of about 300–400 nm. The gas sensing properties of as-prepared products to NO 2 and acetone were investigated. It was found that the sensor based on WO 3 nanostructures exhibited excellent selectivity and high sensitivity toward NO 2 at optimum temperature of 90 °C, giving a response of about 42 to 40 ppb NO 2 . Significantly, operating at 300 °C, the sensor's response and recovery time to 100 ppm acetone was only 1 s and 6 s, respectively.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2013
·
IF 2.112
Wenjun Yan,Ming Hu,Peng Zeng,Shuangyun Ma,Mingda Li
WO 3 nanoparticles were synthesized by sol–gel method with tungsten hexachloride (WCl 6 ) as precursor and deposited onto porous silicon and alumina substrates by dip-coating. The morphology and crystal structure of samples were investigated by means of field emission scanning electron microscope and X-ray diffractometer. It is the experimental results demonstrated by gas sensing tests that WO 3 nanoparticles combining with the substrate of porous silicon presented an improved NO 2 -sensing property at room temperature. Compared to WO 3 deposited on alumina working above 100 °C, the WO 3 nanoparticles/porous silicon exhibited higher properties upon exposure to sub-ppm concentrations of NO 2 gas at room temperature. Additionally, the NO 2 -sensing performance of WO 3 nanoparticles/porous silicon was enhanced markedly, in comparison to pure porous silicon. The mechanism of WO 3 /porous silicon composite structure on the NO 2 sensing was explained in detail.
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Hongtao Wang,Meng Dai,Yueyue Li,Jihao Bai,Yueying Liu,Yuan Li,Chenchang Wang,Fengmin Liu,Geyu Lu
Three different ZnO nanostructures (nanorods/flowers/spheres) were prepared through facile hydrothermal method or water bath, whose sensing properties to NO 2 were investigated in detail at room temperature activated by UV light (365 nm LED). The sensing results showed that ZnO nanospheres exhibit the highest response of 29.4–5 ppm NO 2 , which can be attributed to their biggest specific surface area and the most amount of adsorbed oxygen species on the surface. In contrast, ZnO nanorods show the fastest response and recovery speed (9 and 18 s to 5 ppm NO 2 , respectively) due to their highest crystallinity, least surface defects and unidirectional electron transfer path, which is much faster than most reported literatures. With regard to the ZnO nanoflowers, both the gas-sensing response and the response and recovery speed are between ZnO nanorods and ZnO nanospheres. Furthermore, the stability, selectivity, and the moisture resistance of three different ZnO nanostructures were also researched.
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DOI
高影响因子
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