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
·
半导体物理
·
传感技术
·
纳米材料
·
表面化学
·
环境监测
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yan-nan Wang,Jingfeng Li,Zhiqiang Yang,Zhenyu Yuan,Jin Li,Fanli Meng
In this study, a hollow malposition structure (HMS) optical fiber 2-butanone gas sensor based on double-layer WO 3 @CQDs porous film is proposed, and realizes the ppb detection of 2-butanone gas at room temperature. The HMS can excite the evanescent field and sense the gas adsorption on the fiber surface. The experimental results show sensitivity of 3.09 pm/ppm for this HMS optical fiber gas sensor based on double-layered WO 3 @CQDs porous film, which is 6.05 times higher than that of the sensor coated with single-layer WO 3 @CQDs porous film. In addition, a limit of detection (LOD) reaches 500 ppb. The response time is 11.7 s and the recovery time is 5.72 s. Density functional theory (DFT) results show that the modification of CQDs improves the adsorption capacity of WO 3 @CQDs for 2-butanone gas molecules and changes the refractive index of the material. The sensor has the advantages of small volume, high sensitivity and a low LOD, which is of great significance for the detection of trace 2-butanone gas.
研究领域:
材料科学
·
光学传感
·
气体检测
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
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
·
纳米技术
·
传感器学
·
环境监测
·
半导体物理
·
表面化学
·
气敏传感
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2025
·
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
·
纳米技术
·
气体传感器
·
环境监测
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2025
·
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
·
食品安全
·
纳米材料
·
环境监测
·
分子诊断
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
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
·
纳米科技
·
传感器技术
·
半导体物理
·
环境监测
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Bingcai Chen,Pengpeng Li,Lian Sun,Yingde Wang,Bing Wang
To selectively detect trace carbon monoxide (CO typically lower than 100 ppb) at low temperature is still a great challenge for chemiresistive gas sensors. In this work, we introduce In2O3 nanocubes with exposed {001} facets to couple with MOF-derived porous Co3O4 nanosheets (NSs) forming p–n heterojunction for trace CO detection. Benefiting from the vacancy storing effect of the sub-valent band on In2O3 nanocube {001} facets and the p–n heterojunction effect, the electron–hole recombination is effectively inhibited, and the carrier lifetime is prolonged. As a result, the prepared CoIn0.1-based gas sensor shows a good selectivity and ultralow detection limitation of 25 ppb toward CO at relatively low temperature of 175 °C. In addition, the CoIn0.1-based CO sensor also exhibits high response (272.89%) and ultrafast response/recovery time (2 s/13 s) to 100 ppm CO, which can be ascribed to the fast gas diffusion in the porous Co3O4 NSs and the high-index facet effect of In2O3 nanocubes. This work provides a method to design and synthesize trace CO gas sensors via modulating the band structure of p–n heterojunctions constructed by two-dimensional metal oxide NSs and oxide-exposed high-index facets.
研究领域:
材料科学
·
纳米技术
·
气体传感
·
化学电阻传感器
✓ 已验证
产品关联
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
·
环境监测
·
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
·
传感器技术
·
环境健康
·
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
·
环境监测
·
纳米材料学
·
气体传感技术
·
临床消毒安全
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Adil Shafi Ganie,Shahid Hussain,Aadil Ahmad Bhat,Zhenyu Miao,Talib K. Ibrahim,Xiangzhao Zhang,Mohammed Mujahid Alam,Abdullah G. Al-Sehemi,Rajesh Kumar Manavalan,Guanjun Qiao,Guiwu Liu
The continuous release of harmful gases and increased industrial activities has made environmental monitoring essential for evaluating their impact on human health and ecosystem. In this study, a spherical nanostructure of Nickel (Ni) doped CeO 2 was derived from hydrothermally synthesized cerium-based metal-organic framework (Ce-MOF) via MOF encapsulation-calcination method for ultrasensitive detection of H 2 S at ppb level. The physical characterizations and microstructure of the Ni-CeO 2 composite revealed porous surface with a hollow spherical framework structure. The H 2 S gas-sensing performance of CeO 2 increased with Ni doping and exhibited remarkable sensitivity up to 100 ppb at low operational temperature. Notably, Ni-CeO 2 -6 composite shows an improved response of 108 (R a /R g ) at an operational temperature of 100°C. Furthermore, NC-6 displays good linearity (R 2 =0.998) towards H 2 S concentration with a low detection limit (8.68 ppb). The composite nanostructure shows good humid tolerance with minimum response deviation (6 %), on increasing the relative humidity (RH) from 15 % to 60 % at room temperature. In addition to this, the composite nanostructure shows excellent selectivity towards H 2 S, combined with good repeatability, and sustained stability. The enhanced response of Ni-doped CeO 2 can be correlated with increased surface area, porous morphology, and reactive oxygen sites on the surface. The study reveals the synergistic interplay of MOF-derived framework and Ni doping for increasing oxygen vacancies and enhancing the surface reactivity for improved gas-sensing performance.
研究领域:
材料科学
·
气体传感技术
·
纳米材料
·
环境监测
·
化学传感器
✓ 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
·
气体传感技术
·
纳米材料
·
电子器件
·
环境监测
·
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）