SENSORS AND ACTUATORS B-CHEMICAL
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2021
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IF 7.46
Jinyong Hu,Xiqi Chen,Yong Zhang
High-performance formaldehyde sensors act a significant role in environmental monitoring and industrial gas analysis. However, the traditional side-heating type gas sensors fabricated by handicraft-like brush-painting or drop-casting methods still suffer from poor detection limits and the difficulty of massive fabrication, which hinders the further practical applications of gas-sensing devices. Herein, the uniform LaFeO 3 thin film prepared through a facile sol-gel method combining with spin coating is proposed to achieve batch-fabricated gas sensors for the detection of gaseous formaldehyde. The fabricated gas sensor exhibits a low detection limit as low as 50 ppb toward gaseous formaldehyde, which is lower than the guideline value (80 ppb) limited by World Health Organization. Furthermore, the gas-sensing properties of batch-fabricated thin film gas sensors reveal satisfactory uniformity and replicability with low device-to-device deviation. The maximum variation of baseline resistance between different batch samples is only 5.4%, and the maximum drift of the response value toward formaldehyde is only 6.5%. The favorable gas-sensing performances and high replicability for the sensors might be attributed to the controllable fabrication process that can be completely compatible with the well-established semiconductor technics. This work will open up an effective pathway to prompt high-performance formaldehyde sensors with ppb-level detection limits toward practical applications.
研究领域:
材料科学
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环境监测
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半导体技术
✓ 已验证
DOI
高影响因子
ACS Applied Electronic Materials
·
2025
·
IF 4.7
Qing Han,Xiaoxiao Sui,Gongao Jiao,Zuozhe Ding,Hao Zhang,Dongzhi Zhang
In this work, a low-temperature formaldehyde sensor based on a hydrothermally synthesized tin dioxide/tin selenide (SnO2/SnSe2) nanostructure was demonstrated. The SnO2 nanosheets were decorated on the SnSe2 nanoblocks. The microstructural characterization proves this unique morphology. At 150 °C, the SnO2/SnSe2 composite gas sensor exhibits more than three times the response to formaldehyde gas compared to pure SnO2, with a response of 13.47 to 10 ppm formaldehyde and a response recovery time of 63 s/12 s. In addition, the SnO2/SnSe2 gas sensor is capable of detecting formaldehyde gas at the ppb level. The sensor also exhibits excellent repeatability, excellent long-term performance stability, and resistance to humidity interference. The n–n heterojunction formed between SnO2 and SnSe2, along with its unique microstructure, significantly enhances the performance of the SnO2/SnSe2 sensor. The adsorption behavior of formaldehyde molecules on sensitive material surfaces was studied by using density functional theory.
研究领域:
材料科学
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环境科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Ning Sui,Peng Zhang,Tingting Zhou,Tong Zhang
For realizing high-performance ozone (O 3 ) sensing, hierarchical branch-like In 2 O 3 (B-In 2 O 3 ) nanomaterials were designed and prepared via a facile co-precipitation method. The unique In 2 O 3 structure consists of abundant nano-rods with the length of ca. 450 nm enabling effective adsorption and diffusion of oxygen and O 3 molecules. The sensors based on B-In 2 O 3 showed sensitive O 3 sensing performances at a relative low working temperature. The response of B-In 2 O 3 based sensors to 100 ppb of O 3 is 44 at 70 °C, which is 4.9-fold higher than the commercial In 2 O 3 (C-In 2 O 3 ) particles. The limit of O 3 detection was as low as 30 ppb. Moreover, the gas sensor exhibited excellent selectivity and device stability. The great sensing behavior is proved to be closely related to the oxygen-chemisorbed ability and large specific surface area of In 2 O 3 materials. Taken together, this work provides a potential sensing platform for highly sensitive and ppb-level O 3 detection.
研究领域:
材料科学
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纳米技术
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传感器学
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环境监测
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气体传感材料
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Long Li,Huyin Su,Licheng Zhou,Zhixiang Hu,Tiankun Li,Bingbing Chen,Hua-Yao Li,Huan Liu
Metal sulfide-based gas sensors have the advantage of high sensitivity at room temperature, enabling high integration and low power consumption. However, a trade-off between low baseline resistance and good long-term stability at room temperature still needs to be addressed. Therefore, a single-atom Ce-targeted regulation strategy for p-SnS/n-SnS 2 was proposed. By doping different amounts of Ce, the amount and size of SnS quantum dots on the surface of SnS 2 can be regulated. Furthermore, Sn-S-Ce bonds are formed by combining single-atom Ce with SnS, which effectively hinders the growth and oxidation of SnS quantum dots, as evidenced by STEM, XPS, DFT, FTIR and EAXFS methods. Due to the unique energy band structure of p-SnS and n-SnS 2 , Ce-doped SnS quantum dots serve as electronic sensitizers, effectively increasing the carrier concentration in SnS 2 . The optimal gas sensor based on the 1% Ce-doped SnS/SnS 2 composites enables high sensitivity (with a response of 22.1 to 1 ppm NO 2 ), ultralow detection limit (1 ppb), excellent long-term stability at room temperature, and a lower baseline resistance. This engineering strategy of metal sulfide semiconductor heterostructures through single-atom targeted regulation provides new insights for further optimizing the composite system.
研究领域:
材料科学
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半导体物理
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传感技术
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纳米材料
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表面化学
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环境监测
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
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2025
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IF 19
Ya-Ning Wang,Jia Yang,Xue-Li Hu,Yan-Yang Li,Lin Zhang,Qing-Chao Liu,Hong-Chang Yao
SnO 2 gas sensors have attracted significant interest for formaldehyde detection due to their real-time monitoring capabilities, cost-effectiveness, and portability. However, low sensitivity, poor selectivity, and limited long-term stability remain critical challenges for trace-level formaldehyde detection. Here, the synthesis of SnO 2 nanowires with preferentially exposed high-energy (211) facets and abundant (101) twin defects via a solvothermal approach is reported. Gas-sensing evaluations revealed that sensors constructed from these nanowires, particularly those with maximized exposure of (211) facets and (101) twin defects, exhibited an impressive response of 15.2 toward 10 ppm formaldehyde. Notably, these sensors demonstrated exceptional selectivity for formaldehyde against interfering gases, including methanol, toluene, ammonia, formic acid, acetone, and ethanol, with a detection limit as low as 59 ppb and robust long-term stability. The enhanced formaldehyde sensing performance is attributed to two synergistic effects: i) the increased density of active sites for oxygen adsorption on the high-energy (211) crystal facets, which possess abundant atomic steps, and ii) the Schottky barrier at the twin boundaries, which broadens the depletion layer and accelerates electron transfer through its intrinsic electric field. These findings highlight the promising strategy of engineering high-energy crystal facets and twin defects to significantly elevate the gas-sensing performance of semiconductor nanomaterials.
研究领域:
材料科学
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纳米技术
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传感器学
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环境监测
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半导体物理
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表面化学
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气敏传感
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RARE EARTHS
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2025
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IF 7.2
Yinzhong Liu,Xuechun Yang,Yun Guo,Lingchao Wang,Xiaoshun Wei,Qingjie Wang,Yiyu Qiao,Xiaotao Zhu,Lingli Cheng,Zheng Jiao
n -Butanol, a volatile organic compound with relatively low toxicity, requires precise detection for public health and environmental safety. In this research, metal-organic framework (MOF)-ZnO nanostructures (zinc oxide nano-materials with the utilization of metal-organic frameworks as precursors) doped with rare earth elements (Ce, Eu, and Er) were synthesized via a homogeneous co-precipitation route. The produced samples were comprehensively characterized employing X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Brunauer-Emmett-Teller (BET) method, X-ray photoelectron spectroscopy (XPS), and UV-vis spectroscopy to evaluate the morphological, structural, and optical characteristics. The gas-sensing capabilities of the RE (Ce, Eu, Er)-ZnO series of sensors were subsequently assessed in comparison to those of pristine MOF-ZnO by adjusting the doping type and ratio of rare earth elements to optimize the sensor performance. Among the materials tested, the 0.08 wt% Eu-ZnO sensor exhibits the best-of-breed sensitivity and selectivity, achieving the impressive response value of 616.11 and the detection limit of 361.52 ppb working at 230 °C under 100 ppm of n- butanol exposure, this achievement attains 8.7 times greater than that of pristine MOF-ZnO (70.72). Moreover, with the aid of ultraviolet excitation, the performance of the 0.08 wt% Eu-ZnO sensor is further enhanced, with the sensitivity response elevating to 1000.65 and 4.3 times greater than that of pristine MOF-ZnO (231), leading to the lower detection limit of 259.70 ppb at 220 °C. These findings underscore the significant potential of rare earth incorporation and UV irradiation playing as the synergistic strategy to augment the gas-sensing capabilities, preeminently in the detection of low-concentration volatile organic compounds.
研究领域:
材料科学
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纳米技术
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气体传感器
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环境监测
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
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2025
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IF 6.1
Tingting Wang,Xinhua Zhao,Zhenxu Li,Yi Zhang,Zhu Zhang,Dachi Yang
The newly-emerged gas sensing detection of 1-octen-3-ol biomarker is expected to indirectly monitor foodborne illnesses caused by Salmonella-contaminated meat, which requires high selectivity and a ppb-concentration detection limit. Here, surface-doped ruthenium over tungsten oxide nanocubes (Ru/WO 3 NCBs) have been synthesized by a wet-chemical approach for highly selective and ppb-concentration 1-octen-3-ol sensing. As-prepared Ru/WO 3 NCBs exhibit a polycrystalline structure and consist of NCBs that have an average side length of ∼131 nm, and the Ru/WO 3 NCBs show a high sensing response toward 5 ppm 1-octen-3-ol (R a /R g = 406), excellent selectivity, 50 ppb detection limit, 70% relative humidity tolerance, and 54 days stability at 220 o C. The excellent sensing performance might be attributed to the electronic and chemical sensitization of Ru, which thickens the electron depletion layer and increases adsorbed oxygen to promote interfacial electron transfer and 1-octen-3-ol oxidation. Practically, Ru/WO 3 NCBs have been integrated into a sensing device to simulate detecting 1-octen-3-ol, which has the potential for Salmonella detection in the future.
研究领域:
生物传感
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食品安全
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纳米材料
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环境监测
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分子诊断
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2022
·
IF 9.221
Li Chen,Liu-Xin Cai,Jing Geng,Chen-Chen Liu,Yue Wang,Zheng Guo
One-dimensional (1D) semiconductor composite nanofibers (NFs) with large specific surface areas , high length-to-diameter ratios, and abundant interfacial active sites have received widespread attention. In this work, a rationally designed 1D composite NFs architecture for detecting acetone is synthesized via a two-step process based on electrospinning followed by a thermal oxidation method. Utilizing the polyoxometalate (POM) as a molecular platform with high negative charges to combine transition metal ions precursors, highly dispersed ZnMoO 4 can be in situ grown on the ZnO. By adjusting the content of POM (H 3 PMo 12 O 40 , denoted as PMo 12 ) in the precursor solution , we can obtain a series of ZnMoO 4 decorated ZnO NFs (ZnMoO 4 -ZnO NFs). Compared with the pristine ZnO NFs, the ZnMoO 4 -ZnO NFs sensor exhibited excellent sensing characteristics over a wide range of acetone concentrations (50 ppb-50 ppm), such as high sensitivity , relatively low detection concentration, and high selectivity . The primary mechanism for the improved acetone gas sensing properties of the ZnMoO 4 -ZnO NFs could be ascribed to the available charge transfer and unique structure within ZnMoO 4 -ZnO NFs.
研究领域:
材料科学
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纳米科技
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传感器技术
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半导体物理
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环境监测
✓ 已验证
DOI
高影响因子
Frontiers in Chemistry
·
2021
·
IF 5.221
Wang Yingyi,Liu Lin,Sun Fuqin,Li Tie,Zhang Ting,Qin Sujie
This study reported a novel humidity-insensitive nitrogen dioxide (NO2) gas sensor based on tin dioxide (SnO2)/reduced graphene oxide (rGO) composites through the sol-gel method. The sensor demonstrated ppb-level NO2 detection in p-type sensing behaviors (13.6% response to 750 ppb). Because of the synergistic effect on SnO2/rGO p-n heterojunction, the sensing performance was greatly enhanced compared to that of bare rGO. The limit of detection of sensors was as low as 6.7 ppb under dry air. Moreover, benefited from the formed superhydrophobic structure of the SnO2/rGO composites (contact angle: 149.0°), the humidity showed a negligible influence on the dynamic response (Sg) of the sensor to different concentration of NO2 when increasing the relative humidity (RH) from 0 to 70% at 116°C. The relative conductivity of the sensor to 83% relative humidity was 0.11%. In addition, the response ratio (Sg/SRH) between 750 ppb NO2 and 83% RH was 649.0, indicating the negligible impaction of high-level ambient humidity on the sensor. The as-fabricated humidity-insensitive gas sensor can promise NO2 detection in real-world applications such as safety alarm, chemical engineering, and so on.
研究领域:
材料科学
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环境监测
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气体传感技术
✓ 已验证
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Kun Li,Xueli Yang,Zhen Sun,Xia Zhao,Wanru Xu,Lanxiang Yao,Yuhang Qi,Caixuan Sun,Guofeng Pan
Trimethylamine (TMA) gas is highly irritating and toxic, posing serious threats to human health and the environment. Traditional gas sensors typically rely on elevated temperatures (e.g., 200–400 °C) to activate surface reactions, resulting in high energy consumption and potential safety hazards. In this study, we successfully synthesized a nanocomposite sensing material based on two-dimensional ZnAl layered double hydroxides (LDHs) via a hydrothermal method and applied it for TMA detection at room temperature. To enhance gas sensing performance, In 3+ ions were introduced for surface modification and sensitization, resulting in ZnAlIn-LDHs materials with excellent TMA sensing characteristics. Structural and morphological characterizations confirmed the formation of In(OH) 3 /ZnAlIn-LDHs nanocomposites with optimized microstructures and enhanced surface activity. Gas sensing evaluations revealed that the sensor based on In(OH) 3 /ZnAlIn-LDHs exhibited a high response of 68.5 % ((R a -R g )/R a ∗100 %) to 100 ppm TMA, with a fast response time of 32 s and a recovery time of 34 s at room temperature. Additionally, the sensor demonstrated superior selectivity, long-term stability, and ppb-level detection capability, significantly outperforming pristine ZnAl-LDHs. The synergistic effect between In(OH) 3 and ZnAlIn-LDHs greatly improves the gas sensing performance, offering a promising strategy for the development of next-generation room-temperature TMA gas sensors with high sensitivity and low power consumption.
研究领域:
材料科学
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传感器技术
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环境健康
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纳米科技
·
气体传感
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Zijie Song,Zhenghan Chen,Tingting Zhou,Ning Sui,Tong Zhang
As a commonly used disinfectant in clinical medicine, glutaraldehyde is highly volatile and possesses a ppb-level environmental permissible threshold. Developing a sensitive and portable gas sensing platform for low-concentration glutaraldehyde detection is crucial. Herein, we present an efficient chemiresistive sensor that enables the low-concentration and rapid detection of glutaraldehyde. The sensor is based on SnO 2 nanofibers (NFs) functionalized with bimetallic PtPd nanocatalysts (NCs). Square-shaped PtPd NCs with a uniform edge length of 8.2 nm are synthesized by a hydrothermal method and then introduced into SnO 2 NFs. The resulting PtPd-SnO 2 -1 sensor yields a rapid, sensitive, and reversible response to glutaraldehyde gas, with a theoretical detection limit of 10.7 ppb. The remarkable gas sensing properties are attributed to the sensitization and synergistic effect of PtPd NCs, thereby promoting the formation of chemisorbed oxygen species and enhancing the response. Density functional theory (DFT) results show that the catalytic effect of bimetallic PtPd NCs leads to an increase in adsorption energy as well as charge transfer, and Pd-doping-induced shift of the d-band center. As a key component, the sensor is integrated into a wireless glutaraldehyde sensing platform, which integrates a circuit board and a smart terminal, thus achieving convenient and effective glutaraldehyde detection. The finding indicates that the PtPd-SnO 2 sensor is a potential candidate for practical glutaraldehyde detection.
研究领域:
生物医学工程
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环境监测
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纳米材料学
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气体传感技术
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临床消毒安全
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Lin Chen,Xi Chen,Fei Wang,Yu Tong,Kewei Zhang,Zhengbo Han,Mingzhe Zhang
Metal-organic frameworks (MOFs) are regarded as potential candidate materials with great application prospects in the field of gas sensing. In this study, MOF derivatives were anchored onto MXene sheets through self-assembly technology to prepare a heterojunction material ZnO/Ti 3 C 2 T x MXene with high specific surface area, achieving ultrafast dual gas sensing behavior for H 2 /NO 2 . At a low temperature of 80°C, the ZnO/ Ti 3 C 2 T x MXene heterojunction sensor exhibited an ultrafast response (23.17%) to 500 ppb H 2 within 3.2 s. After a moderate temperature increase to 180°C, it also demonstrated significant sensing performance (46.3%) to 500 ppb NO 2 within 4 s. The electronic interaction mechanism of ZnO/ Ti 3 C 2 T x MXene heterostructures in H 2 and NO 2 detection was revealed through density functional theory calculations and in-situ Raman spectroscopy, clarifying the influence of interfacial charge transfer on sensing performance. Heterogeneous structures achieve the regulation of gas adsorption-induced electron rearrangement and carrier modulation by constructing interface charge-regulating channels, significantly enhancing the response rate, selectivity and reversibility in the detection of H 2 and NO 2 , thereby enabling highly sensitive and trace detection of the two gases.
研究领域:
材料科学
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气体传感技术
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纳米材料
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电子器件
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环境监测
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能源安全
✓ 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）