Nanomaterials
·
2022
·Vol. 12
·期 15
·2579
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IF 5.719
Beiying Qi,Xinchang Wang,Xinyue Wang,Jipeng Cheng,Yuanyuan Shang
Metal–organic framework (MOF)-derived pure ZnO and Cu-doped ZnO nanocages were fabricated by calcining a zeolitic imidazole framework (ZIF-8) and Cu-doped ZIF-8. The morphology and crystal structure of the samples were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), and high-resolution transmission electron microscopy (HRTEM). It was found that Cu doping did not change the crystal structures and morphologies of MOF-derived ZnO nanocages. The H2S-sensing properties of the sensors based on ZnO and Cu-doped ZnO nanocages were investigated. The results indicated that the H2S-sensing properties of MOF-derived ZnO nanocages were effectively improved by Cu doping, and the optimal doping content was 3 at%. Moreover, 3 at% Cu-doped ZnO nanocages showed the highest response of 4733 for 5 ppm H2S at 200 °C, and the detection limit could be as low as 20 ppb. The gas-sensing mechanism was also discussed.Keywords:MOF-derived ZnO;nanocages;Cu doping;H2S sensing
研究领域:
材料科学
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传感器技术
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DOI
PubMed
高影响因子
MATERIALS RESEARCH BULLETIN
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2023
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IF 5.4
Zhen Zhao,Lei Zhang,Hongming Zhang,Wuhong Xin,Xiaowen Wang,Chunmiao Liu,Yang Guo,Yinghua Zhuang,Wanli Jiao
Investigating high-performance and low-energy consumption H 2 S sensors has become a hot research topic. This study adopted a one-step co-precipitation method to synthesize La-doped ZIF-8 deprotonating zinc acetate, lanthanum nitrate, and 2-Methylimidazole in an aqueous. La 2 O 3 /ZnO were synthesized with different La 3+ doping concentrations (0, 0.5, 1, and 1.5 at%). We found that La 3+ doping at a concentration of 1 at% showed the highest response value of 140 for 5 ppm H 2 S, at a low operating temperature of 100 °C, which is 2.4 times higher than that of pure ZnO. Additionally, La 3+ doping led to a lower detection limit of 1.9 ppb. The enhanced performance can be attributed to the widening of the difference in electron concentration, the increase in vacant oxygen content, and the spillover effect of H 2 S sensing. These factors were analyzed in detail by means of porosity, P-N heterojunctions, and the increased in adsorbed oxygen content caused by La 3+ doping.
研究领域:
材料科学
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传感器技术
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DOI
高影响因子
Advanced Science
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2024
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IF 14.3
Yanghai Gui,Jintao Wu,Di Zhao,Kuan Tian,Shuaishuai Zhao,Huishi Guo,Xiaoyun Qin,Xiaomei Qin,Dongjie Guo,Yun Wang
H 2 S gas sensors with facile preparation, low detection limits, and high selectivity are crucial for environmental and human health monitoring. However, it is difficult to maintain a high response of H 2 S gas sensors under high humidity in practical applications. To face this dilemma, a layer-by-layer growth method is applied to in situ prepare a nanostructured Co(CO 3 ) 0.5 (OH)·0.11H 2 O/WO 3 coated by a hydrophobic hierarchical ZIF-67 as the H 2 S sensor. This novel composite exhibits excellent humidity immunity without sacrificing the excellent sensitivity and selectivity of H 2 S. At a low operating temperature of 90 °C, a remarkable response value of 1052.3 to 100 ppm H 2 S has been achieved, which is 779 and 9.36 times higher than that of pure WO 3 and Co(CO 3 ) 0.5 (OH)·0.11H 2 O/WO 3 , respectively. More importantly, an 82.2% relative response value remains at a high humidity of 75%RH. The sensing mechanisms are investigated using gas chromatography-mass spectrometry (GC-MS), which revealed that the reaction products are H 2 O and SO 2 . The high humidity immunity and fast response of the Co(CO 3 ) 0.5 (OH)·0.11H 2 O@ZIF-67/WO 3 demonstrate the layer-by-layer in situ synthesis method holds the potential application for the development of high-performance WO 3 -based H 2 S sensors.
研究领域:
材料科学
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环境监测
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传感器技术
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DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2015
·Vol. 4
·期 3
·1096-1104
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IF 7.443
Hao Wu,Zhimin Chen,Jialin Zhang,Feng Wu,Chunying He,Bin Wang,Yiqun Wu,Zhiyu Ren
Cost-efficient, highly sensitive and stable sensing materials play a key role in developing H2S sensors. Herein, tetra-β-carboxyphenyloxyphthalocyanine cobalt(II) (cPcCo) has been successfully bonded on the surface of acidified multiwalled carbon nanotubes (aCNTs) by a facile two-step condensation reaction in the presence of N,N′-dicyclohexylcarbodiimide (DCC), using hydroquinone (HQ), p-aminophenol (PAP), and p-phenylenediamine (PPD) as linking molecules, respectively. The obtained cPcCo–B–aCNT (B= HQ, PAP, and PPD) hybrids display good dispersibility in ethanol, which is beneficial to construct uniform sensing devices. The cPcCo–B–aCNT sensors, with a loose network-like structure, present abundant exposed sensing sites, oriented transmission of charges, and unimpeded pathways for H2S diffusion, which endow the cPcCo–B–aCNT hybrids with excellent sensing performance, in terms of sensitivity, reliability, reproducibility, and detection limit. The detection limit of the sensors composed of cPcCo–B–aCNT hybrids towards H2S reaches the ppb-level at room temperature, which is about the same as the odor threshold level for humans. For the cPcCo–HQ–aCNT sensor, the response to H2S varies linearly with respect to its concentration from 20 to 160 ppb and from 320 to 2560 ppb, with the highest gas response of 2.5% to 80 ppb H2S and a low detection limit of 5 ppb. Furthermore, the linking molecules play a critical role in the sensitivity of H2S, as evidenced from the current–voltage characteristics. The systematic study developed here provides a valid way to fabricate other high-efficient H2S sensors.
研究领域:
材料科学
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化学传感器
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2022
·
IF 9.221
Cheng Feng,Congting Zhang,Chang Xu,Shuang Lin,Baohua Zhang,Huanxing Wu,Zheng Zhang,Xinming Guo,Haineng Bai,Fuqiang Guo
The detection of H 2 S for biomarkers or special occasions often requires a lower detection limit. In this work, the ppb-level H 2 S sensor based on MoO 3 /CuO/g-C 3 N 4 (MCC) was presented by a simple method. The characterized results show that MCC-2 possesses a larger specific surface area, and has more adsorbed oxygen and oxygen vacancy compared to MoO 3 and MoO 3 /CuO. The gas-sensitive test results show that the response of the MCC-2 sensor to 1000 ppb H 2 S is up to 8.24 at room temperature , which is 1.31 times of MoO 3 /CuO (6.28). More importantly, the theoretical detection limit of the MCC-2 sensor is as low as 1.1 ppb, which is the lowest in the recent H 2 S sensor. In addition, the MCC-2 sensor has reliable repeatability, excellent selectivity to H 2 S, and still maintains a high response after continuous test for 5 weeks. Simultaneously, the MCC-2 sensor also keeps an outstanding response at high relative humidity. The excellent gas sensing properties are due to the larger specific surface area that can enable more gases to be adsorbed on the material surface. In addition, the oxygen vacancy reduces the energy required to adsorb the target gas and the formed heterojunctions by MoO 3 /CuO/g-C 3 N 4 expedite carrier migration.
研究领域:
材料科学
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环境科学
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化学
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Xiang Li,Huimin Yang,Qirui Wu,Chaoqi Zhu,Jiahong Tang,Chaofan Ma,Lu Tang,Huiyu Su,Xiaoxia Wang,Changsheng Xie,Dawen Zeng
Limited by the dense arrangement of oxygen atoms in the outer layer, the active Mo sites of MoO 3 ultrathin nanoflowers are shielded by oxygen, making it difficult for efficient gas adsorption. Here, oxygen atoms on the surface of MoO 3 nanoflowers (MoO 3 NFs) were knocked out based on a simple hydrogenation strategy to obtain MoO 3 defective nanoflowers (MoO 3 DNFs) with abundant molecular traps and exposed Mo sites. Notably, the response of MoO 3 DNFs-10 to 2 ppm H 2 S is 3 times that of MoO 3 NFs. Oxygen atom knockout was verified based on Laser Raman Spectroscopy, Photoluminescence (PL), UV–Visible Spectroscopy (UV–Vis), and X-ray photoelectron energy Spectroscopy (XPS), while calculations based on density functional theory (DFT) were used to reveal the sensing enhancement of molecular traps and exposed Mo sites. On the one hand, molecular traps can effectively trap H 2 S molecules to facilitate further adsorption. On the other hand, exposed Mo sites have higher charge activity and exhibit higher adsorption capacity for H 2 S gas. This work breaks through the limitations of the traditional oxygen vacancy model and innovatively discusses the synergistic effect of molecular traps and exposed Mo sites on enhanced sensing, which can provide a reference for the gas sensing by metal oxide semiconductors.
研究领域:
材料科学
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传感器技术
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DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
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2025
·
IF 3
Li Ouhang,Wang Bo,Liu Yong,Gao Xinxin,Zhang Kan,Sun Peng,Liu Fangmeng,Lu Geyu
The sensitive and selective detection of ppb-level (ppb: parts per billion) H 2 S using miniaturized and portable gas sensor is of great significance in environmental monitoring, medical diagnosis and many other fields. MXenes, with high electrical conductivity, large surface area, and abundant active sites, hold great promise for room temperature gas sensing applications. In this work, a room temperature H 2 S sensor was constructed utilizing Mo 2 CT x MXene sensitive material, synthesized by a typical LiF/HCl etching method. The H 2 S sensing characteristics of Mo 2 CT x sensor were further improved by controlling ultrasonic time and optimizing heat-treated temperature. The M-50 sensor utilizing optimized Mo 2 CT x sensing material exhibited good selectivity, the highest response value (−39.92%) to 1 ppm (ppm: parts per million) H 2 S, and the lowest detection limit of 30 ppb (theoretically 0.35 ppb). The enhanced H 2 S sensing properties are largely attributed to the fragmented nanosheet structure and surface defects caused by prolonging ultrasonic time and adjusting treatment temperature. Additionally, density functional theory (DFT) calculations demonstrated that surface Mo atom vacancy and edge of Mo 2 CT x could significantly improve the adsorption ability of H 2 S. The present work contributes to advancing exploration of Mo 2 CT x material in sensing applications.
研究领域:
材料科学
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环境监测
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医学诊断
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DOI
高影响因子
ACS ES&T Engineering
·
2024
·
IF 7.4
Peijin Zou,Zhuangzhuang Ma,Zihuan Tang,Xiaotong Gao,Xiaoxiong Hou,Lichao Jia
Achieving the real-time detection of hydrogen sulfide (H2S) based on metal oxide semiconductor (MOS) gas sensors is of great significance for rapid disease diagnosis. However, the high-power consumption and poor selectivity severely limit its practice application. In this study, a platinum nanoparticle (Pt NPs)-loaded porous metal–organic framework (MOF)-derived SnO2 material was successfully synthesized to optimize the H2S-sensing performance at room temperature. The optimized Pt-loaded porous SnO2-based gas sensor exhibited remarkably high sensitivity (712–10 ppm), fast response (21 s), good selectivity, and extremely low detection limit for H2S (10 ppb) at room temperature. The in-depth analysis demonstrated that the porous structure of Sn-MOF can provide adequate active reaction sites for gas molecules. Moreover, the uniform distribution of surface-loaded Pt NPs can initiate electron and chemical sensitization effects, thereby improving the sensing performance. The successful application of Pt NPs provides a novel approach to improve the room-temperature (RT) sensing performance of metal-oxide-semiconductor-based gas sensors.
研究领域:
材料科学
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医学诊断
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传感器技术
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Zongxu Liu,Jiaxue Song,Tao Wang,Huaiqiang Liu,Jie Chen,Yuanyuan Sun,Pinhua Zhang,Guangliang Cui
Technology development of low-concentration H 2 S sensing at low temperatures is of great significance for real-time surveillance of specific diseases and environment. In this work, a new Cu 2 O/graphene heterojunction sensor with an ideal interface is fabricated by 2D electrodeposition in-situ assembly method. The sensor is extremely selective to H 2 S and exhibits ultra-high H 2 S sensing properties at room temperature (R = 24125.785 % for 500 ppb H 2 S). Notably, the synergistic effects of barrier modulation and the sulfide reaction enable the sensor to detect H 2 S at concentrations as low as 5 ppb (R = 386 %) at 20 °C. Moreover, it exhibited good gas sensitivity even at temperatures as low as −20 °C (R = 71.26346 % for 100 ppb H 2 S). Furthermore, a sensor device was successfully manufactured for practical detection, which could be used for rapid detection of exhaled air and atmospheric monitoring. This work provides a new strategy for the design of high-sensitive and reliable room-temperature sensing materials for trace H 2 S gas detection.
研究领域:
材料科学
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环境科学
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医学检测
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Shuqin Yang,Zhilong Song,Naibo Gao,Zhixiang Hu,Licheng Zhou,Jingyao Liu,Baohui Zhang,Guangzu Zhang,Shenglin Jiang,Hua-Yao Li,Huan Liu
Indium oxide (In 2 O 3 ) nanomaterials have been investigated extensively as promising candidates for gas sensor applications. Here, we fabricate near room temperature operable H 2 S-sensitive gas sensors based on In 2 O 3 colloidal quantum dots (CQDs). Room-temperature film deposition of In 2 O 3 CQDs followed by surface ligand exchange treatment through Cu inorganic salts was employed to construct the sensor devices. Combined with a moderate annealing treatment, the long-chain ligands surrounding the quantum dot surfaces were completely removed to enhance gas adsorption and carrier transport, simultaneously resulting in the formation of CuO that may act as a catalytic promoter or form p-n heterojunction for selective H 2 S detection. The sensors exhibited high response up to 90 toward 5 ppm of H 2 S with response/recovery time of 72 s/200 s respectively, suggestive of a performance improvement compared to the In 2 O 3 -based H 2 S sensors reported in existing literature. The power law analysis indicated that the main oxygen species adsorbed on the surfaces were O 2 − and O − with the proportion of approximate 1:1 at near room temperature. The gas-sensing mechanism was attributed to the decisive role of surface states in determining the electrical conduction of quantum dot gas sensors.
研究领域:
材料科学
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传感器技术
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纳米科技
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DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2022
·
IF 10.508
Yan Liu,Ruoxuan Guo,Kaiping Yuan,Min Gu,Mengli Lei,Chenyi Yuan,Meiqi Gao,Yuejie Ai,Yaozu Liao,Xuanyu Yang,Yuan Ren,Yidong Zou,Yonghui Deng
Chemiresistive gas sensors are widely used in environmental monitoring and industry production; however, their selectivity and sensitivity are yet to be improved and their working temperature is usually too high (around 250 °C), which limit their applications in detecting trace gases at low temperatures due to the low activity of sensitive layers. Herein, novel Ce-doped mesoporous WO3 with high specific surface areas of 59–72 m2/g, a stable crystalline framework, and finely tailored pore walls was synthesized via a facile in situ cooperative assembly method combined with a carbon-supported crystallization strategy. The doping of Ce atoms in the mesoporous WO3 pore wall can effectively adjust the coordination environment of W atoms, giving rise to dramatically enhanced oxygen vacancy (Ov) and forming Wδ+-Ov sites. As a result, the obtained Ce-doped mesoporous WO3 showed excellent H2S sensing performance at a low working temperature (150 °C) with an ultrahigh response value (381 vs 50 ppm), fast response dynamics (6 s), outstanding selectivity, and antihumidity property as well as good long-term stability. The superior gas sensing performance is attributed to the increased Ov density and enhanced conversion of surface-adsorbed H2S into SOx and SOx2– during the surface adsorption-catalysis reaction in the sensitive layer. Density functional theory (DFT) calculations reveal that Ce4+ is embedded into the crystal lattice of WO3 to form an optimal structure rather than atom substitution, and Ce-doped WO3 shows a higher H2S adsorption energy and a larger charge transfer than that in pure WO3, accounting for the better H2S sensing response of Ce4+-doped WO3. Furthermore, a novel gas sensing module and smart portable sensor device based on Ce-doped mesoporous WO3 was developed for efficient real-time monitoring of H2S concentration on a smartphone via Bluetooth communication.
研究领域:
材料科学
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化学传感器
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环境监测
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Junqiang Bao,Ziyi Zhang,Yangong Zheng
H 2 S is a flammable, explosive, and highly toxic gas; consequently, a high-performance H 2 S sensor based on metal oxides is required. In this study, two-dimensional MoO 3 nanoflakes were synthesized through facile liquid-phase exfoliation. The thickness of the prepared MoO 3 is approximately 4.2 nm. High-performance was obtained using a gas sensor based on two-dimensional MoO 3 nanoflakes at a working temperature of 300 °C. In addition, the lowest detection limit can be in the range of parts per billion, and the sensor exhibits high resistance to humidity. The sensing mechanism is discussed based on the results of ex situ characterizations of the sensing process and computation of the electronic structure. The results indicate that the chemically reversible sensing process is based on the transition between sulfidation and oxidation, where sulfidation promotes the mobility of electrons and increases the conductivity of MoO 3 . This novel sensing mechanism provides a new perspective for the study of H 2 S sensors based on metal oxides.
研究领域:
材料科学
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化学工程
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电子工程
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DOI
高影响因子
危险品化学品经营许可证（带存储）