APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Hailin Zheng,Demin Zhu,Chengyi Xiong,Xiquan Hu,Miao-Miao Chen,Shengfu Wang,Yao Xiao,Xiuhua Zhang
Structure defects of advanced two-dimensional (2D) transition metal dichalcogenides (TMDCs) have provided enormous opportunities for modified band structures and fascinating properties to facilitate the development of fundamental studies, among which intrinsic defects can be spontaneously introduced to 2D materials to expand the functional diversity. Except for unary intrinsic defects, structure–activity relationships of multiplex intrinsic defects and modulated properties still remain to be released for practical applications. Herein, binary intrinsic defects in exfoliated molybdenum disulfide (MoS 2 ), including sulfur monovacancies and oxygen substitution, were studied for revealing the sensing mechanism of 2,4,4′-trichlorobiphenyl (PCB28). They theoretically tended to form homosteric associated pairs and promote molecular anchoring synergistically. Appropriate molecular adsorption and efficient electron transfer enabled the excellent sensing performances for PCB28 including considerable linear region of 100 ng mL −1 ∼ 1 mg mL −1 and low detection limit of 7.96 ng mL −1 , which was also inspirable for the design of other small-molecule sensors.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Ping Hu,Jun Sun,Bo Ran,Jialin Li,Jialu Fang,Qihua Sun,Ning Tian,Zhaofeng Wu,Haiming Duan
The detection of hydrazine (N 2 H 4 ), a highly toxic and explosive compound, is of paramount importance for ensuring environmental and industrial safety. However, research on chemoresistive gas sensors for N 2 H 4 detection, particularly the underlying mechanisms, remains limited. To address this gap, we have prepared carbon materials with a unique morphology and trace K doping through a simple carbonization process, utilizing raw cotton straw (RCS) as the starting material. The CS-400 sensor obtained under calcination at 400 °C exhibited high sensitivity and selectivity for N 2 H 4 , with a response of 30.6 k% and a detection limit of 0.55 ppm for 500 ppm N 2 H 4 at room temperature. Subsequently, the gas sensing mechanism of the straw-based biochar material was focused on, and the roles of cellulose, hemicellulose and lignin in the RCS were analyzed. The interaction between defects and carrier concentration during pyrolysis was elucidated. First-principles calculations confirmed that trace K doping and surface adsorbed oxygen enhance the adsorption of target gases, thereby improving the sensor performance.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Chuanxi Sun,Sen Li,Ziqi Zhou,Xiaoxiao Chen,Zhe Liu,Shenglong Liao,Jian Xing,Hongyan Sun,Yu Cheng,Zhengkun Yi,Jianfeng Chen,Zhihua Li
The clear aligner, commonly utilized in orthodontic treatment for malocclusion, necessitates the quantification of orthodontic forces, which is highly demanded by doctors for enhancing risk management and treatment efficiency. However, the current technology still faces obstacles in achieving conformal integration of pressure sensors onto clear aligners with large curvature for the quantification and real-time monitoring of orthodontic forces. In this paper, a conformal iontronic sensing clear aligner (CSA) is proposed based on flexible iontronic sensing mechanism, which conformally integrates the sensor with the aligner to quantify orthodontic forces throughout the treatment process while preserving the aligner's original function. Specifically, the ionic coating is seamlessly integrated onto the diaphragm by applying a layer of ionic paint before molding the clear aligner, while the sensing electrode array, designed using a kirigami-based structure, is seamlessly adhered to the ionic coating. By integrating the CSA into a dental model, its exceptional sensitivity and precise pressure mapping capabilities have been demonstrated. This enables the identification of various tooth movement patterns, discernment of orthodontic force magnitude, and continuous monitoring of forces throughout the orthodontic treatment. Consequently, this research is expected to significantly advance risk management, outcome prediction, and treatment efficiency in orthodontic treatments.
研究领域:
牙科学
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生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Jianxun Dai,Xin Guan,Hongran Zhao,Sen Liu,Teng Fei,Tong Zhang
Electronic devices that can accurately record and monitor human respiration in real-time are of great interest for researchers. Ultrafast-response ionogel humidity sensors that can follow the human respiration were realized by an in-situ vinyl-thiol click reaction in this work. Polyacrylic acid (PAA) was utilized both as the template to construct porous films and for preparing humidity sensing component. The obtained optimal sensor owns a rapid response to humidity change (response and recovery time is 1.2 s and 0.6 s, respectively) and a small humidity hysteresis (∼2.2% RH). The water adsorption capability and sensing mechanism were investigated systematically. The ionogel humidity sensor with good stability and repeatability was applied in breath monitoring, which has a great potential application in diagnostic breath analysis.
研究领域:
材料科学
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生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Xin Dong,Xiaoli Cheng,Xianfa Zhang,Lili Sui,Yingming Xu,Shan Gao,Hui Zhao,Lihua Huo
The coral-shaped Dy 2 O 3 was prepared by a simple and environmentally friendly hydrothermal reaction combined with subsequent calcination. The coral-shaped Dy 2 O 3 was assembled by clusters, which were constructed by nanoparticles, whose sizes are 12.3 ± 3.6 nm. The gas sensors were investigated with nine gases at room temperature, and show a high response and selectivity to NH 3 . Compared with other reported metal oxide-based sensors, Dy 2 O 3 sensor exhibits not only high sensitivity, good selectivity and reproducibility to NH 3 at room temperature, but also two good linear relationships when the concentration of NH 3 is in the range of 0.1–1 ppm and 1–100 ppm. The good gas sensing property is mainly because of the 3D hierarchical structure of coral-like Dy 2 O 3 , which has a large specific surface area. This benefits NH 3 molecules to adsorb/desorb onto/from the surface as well as the electron transfer. In addition, the possible NH 3 -sensing mechanism is discussed in detail.
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
DOI
高影响因子
RARE METALS
·
2020
·Vol. 40
·期 6
·1571-1577
·
IF 2.161
Zhu Meng-Ya,He Ping,Yang Xue-Li,Hui Guang-Ze,Tang Cheng-Chun,Pan Guo-Feng,Bie Li-Jian
Abstract P-xylene (p-C 8 H 10 ) is extremely harmful and dangerous to human health due to high toxicity and strong carcinogenicity. Exploring sensitive material to effectively detect p-xylene is of importance. In this paper, perovskite single crystal (C 4 H 9 NH 3 ) 2 PbI 4 has been successfully synthesized via solution method. The obtained product was analyzed by single crystal X-ray diffraction. With the space group Pbca, orthorhombic (C 4 H 9 NH 3 ) 2 PbI 4 layered perovskite structure consists of an extended two-dimensional network of corner-sharing PbI 6 octahedron. Single layer perovskite sheets of distorted PbI 6 octahedron alternated with protonated n-butylammonium cation bilayers, which offers many advantages and provides the possibility of forming a gas sensor device based on the change of resistances. Density functional theory (DFT) simulations regarding the adsorption energy revealed that this organic–inorganic hybrid perovskite compound has excellent selectivity toward p-xylene compared with other gases including C 2 H 5 OH, C 6 H 6 , CH 2 Cl 2 , HCHO, CH 3 COCH 3 and C 7 H 8 . The calculation of electron density, density of states and electron density difference showed the sensing mechanism of p-C 8 H 10 is mainly derived from physical adsorption–desorption in view of electron transfer. Graphic abstract For organic–inorganic hybrid perovskite (C 4 H 9 NH 3 ) 2 PbI 4 , single layer perovskite sheets of distorted PbI 6 octahedron alternated with protonated n-butylammonium cation bilayers (a), which offers many advantages and provides the possibility of forming a gas sensor device based on the change of resistances. Electron density difference calculation shows that adsorption of p-xylene molecule has an obvious effect on the electron distribution of (C 4 H 9 NH 3 ) 2 PbI 4 , results in electrically polarization as a local manner (b).
研究领域:
材料科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS
·
2025
·Vol. 25
·期 9
·2634
·
IF 3.5
Mengxue Xu,Yihong Zhong,Hongpeng Zhang,Yi Tao,Qingqing Shen,Shumin Zhang,Pingping Zhang,Xiaochun Hu,Xingqi Liu,Xuhui Sun,Zhenxing Cheng
HighlightsWhat are the main findings?The problem of dichloromethane “poisoned” MOS materials was well solved.Gas sensing mechanism of dichloromethane on the MOS material was elucidate.What is the implication of the main finding?The best performance of significant response and excellent recoverability by the MEMS sensor to dichloromethane is attributed to a synergetic effect from Mo and Ni co-doping into SnO2.Kinetically, the transportation of dichloromethane molecules onto the surface determines the response process. Thermodynamically, the output steady electronic signal of the MEMS sensor follows the equations newly derived by statistical mechanics.The challenging problem of chlorine “poisoning” SnO2for poorly recoverable detection of dichloromethane has been solved in this work. The materials synthesized by Ni or/and Mo doping SnO2were spread onto the micro-hotplates (<1 mm3) to fabricate the MEMS sensors with a low power consumption (<45 mW). The sensor based on Mo·Ni co-doped SnO2is evidenced to have the best sensing performance of significant response and recoverability to dichloromethane between 0.07 and 100 ppm at the optimized temperature of 310 °C, in comparison with other sensors in this work and the literature. It can be attributed to a synergetic effect of Mo·Ni co-doping into SnO2as being supported by characterization of geometrical and electronic structures. The sensing mechanism of dichloromethane on the material is investigated. In situ infrared spectroscopy (IR) peaks identify that the corresponding adsorbed species are too strong to desorb, although it has demonstrated a good recoverability of the material. A probable reason is the formation rates of the strongly adsorbed species are much slower than those of the weakly adsorbed species, which are difficult to form significant IR peaks but easy to desorb, thus enabling the material to recover. Theoretical analysis suggests that the response process is kinetically determined by molecular transport onto the surface due to the free convection from the concentration gradient during the redox reaction, and the output steady voltage thermodynamically follows the equation only formally identical to the Langmuir–Freundlich equation for physisorption but is newly derived from statistical mechanics.
研究领域:
材料科学
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传感器技术
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物理化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 18
·14552-14558
·
IF 3.289
Jimin Hou,Huihan Huang,Zhizhong Han,Haibo Pan
CeVO4 nanorods (NRs) were successfully synthesized via a one-step hydrothermal method using disodium edentate (EDTA) as a chelating agent. The CeVO4 NRs are assigned to the zircon-type tetragonal structure and exhibited pure single-crystals as determined by XRD analysis. FE-SEM images indicate that the as-prepared samples are present as square-section nanorods, and the length and sectional size of the CeVO4 NRs are found to be ∼1.5 μm and ∼100 nm, respectively. Moreover, the HRTEM images and SAED diffraction patterns confirm that the main exposed surfaces of the CeVO4 NRs were the (010) and (004) lattice planes with a high exposed percentage (ca. 96.77%) around the NRs and the growth direction was along the (200) lattice plane. The CeVO4 NRs presents a pure phase, with no other impurity phases identified from the FTIR and Raman spectra. XPS results indicate that the vanadium atoms on the surface exhibit a mixture of valence states, i.e., pentavalent state (V5+) and trivalent state (V3+), as dangling bonds around the oxygen vacancies were induced by EDTA desorption during hydrothermal process. An acetone gas sensor based on the CeVO4 NRs was fabricated, which exhibits a significant response (0.5 s) and recovery (80 s) with high selectivity at the optimum working temperature (108 °C). This is mainly due to the presence of the trivalent states (V3+), which serve as the active sites and provide a large number of oxygen vacancies (Vo) as identified by XPS and infrabar experiments at 300 ppm O2 (0.003 atm). Moreover, it has been demonstrated that the response to acetone for the gas sensor was crucially dependent on the adsorbed oxygen (Oads) on the (010) or (004) facets of the CeVO4 NRs, where the redox reaction with acetone occurred reversibly.
研究领域:
材料科学
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化学
✓ 已验证
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2022
·
IF 8.008
Jiaxi Hu,Hongjie Song,Cheng Chen,Lichun Zhang,Mingxia Sun,Yi Lv
Cataluminescence as a highly efficient gas transduction principle has attracted wide attention among research in environmental monitoring and clinical diagnosis with increasing awareness of human safety. Nowadays, the development of innovation sensing systems and the construction of the sensing mechanism to improve the analytical performance of compounds remain a major challenge. Herein, we construct an advanced photoinduced thermocatalytic chemiluminescence (PI-TC-CL) gas-sensing system via the introduction of a Z-scheme heterojunction Ag3PO4/Ag/Bi4Ti3O12 to achieve higher efficient detection of H2S. The unique electron transport path of the Z-scheme heterojunction and the LSPR effect of Ag nanoparticles fascinate the generation of the photoinduced electron–hole pair on the surface of catalysts when stimulated by LED lamps and slow down the recombination of electron–hole pairs under thermal conditions. Thus, based on the cooperative effect of the Z-scheme heterojunction AgPO/Ag/BTO and PI-TC-CL system, we have successfully established an efficient H2S CTL detection system, which has a response three times higher than that on the traditional CTL system and even 45 times higher than that on BTO and ranges among the best of the state-of-the-art CTL performance in H2S detection with the linear range of 0.095–8.87 μg mL–1 and a limit of detection of 0.0065 μg mL–1. Besides, to explore the gas-sensing mechanism, the synergetic effects of photoinduction and thermal catalysis are investigated thoroughly via conductivity and electrochemical experiments. This research provides a new perspective of engineering highly efficient catalysts and ingenious sensor systems through designing the nanostructure of materials and synergism catalytic mechanism.
研究领域:
环境科学
·
分析化学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2024
·Vol. 171
·期 2
·027509
·
IF 3.1
Feng Shao,Shuohao Hu,Wanqing Huang,Xuhui Sang,Shangjian Liu,Xi Wan,Xiaofeng Gu
The electrolyte gating of transistors, which directly couples ion transport with electron conduction, is particularly interesting in the field of bio and chemical sensing. When a humidity-sensitive polyelectrolyte is used as the gate dielectric, the resulting ionotronic device becomes a humidity-sensitive transistor providing potential advantages in signal amplification and circuit integration. In this work, a humidity-sensitive polyelectrolyte-gated metal oxide transistor is reported by implementing the capacitive-to-resistive-based sensing mechanism. Due to the correlation between drain current and gate capacitance, the measurement of capacitance or impedance for humidity sensors is converted into the measurement of resistance. Initial sensing studies in the quasi-static DC sensing mode resulted in a limited sensing response. A pulsed sensing mode was proposed to considerably enhance the sensing response ID,80%RH/ID,20%RH to 861. The response in the specific RH range was also found to be tunable with the applied sensing signal. The underlying mechanism is elucidated with frequency-dependent capacitance and impedance analysis of the gate electrolyte using corresponding equivalent circuit model.
研究领域:
电子器件
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化学传感器
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材料科学
✓ 已验证
DOI
高影响因子
Small
·
2023
·
IF 13.3
Xinlei Li,Shupeng Sun,Nan Wang,Baoyu Huang,Xiaogan Li
Non-invasive breath testing has gained increasing importance for early disease screening, spurring research into cheap sensors for detecting trace biomarkers such as ammonia. However, real-life deployment of ammonia sensors remains hindered by susceptibility to humidity-induced interference. The SnTe/SnSe heterojunction-based chemiresistive-type sensor demonstrates an excellent response/recovery to different concentrations of ammonia from 0.1 to 100 ppm at room temperature. The improved sensing properties of the heterojunctions-based sensors compared to single-phased SnTe or SnSe can be attributed to the stronger NH 3 adsorptions, more Te vacancies, and hydrophobic surface induced by the formed SnTe/SnSe heterojunctions. The sensing mechanisms are investigated in detail by using in situ techniques such as diffuse reflectance Fourier transform infrared spectroscopy (DRIFTS), Kelvin probe, and a.c. impedance spectroscopy together with the Density-Function-Theory calculations. The formed heterojunctions boost the overall charge transfer efficiency between the ammonia and the sensing materials, thus leading to the desirable sensing features as well, with excellent resistance to ambient humidities.
研究领域:
材料科学
·
传感器技术
·
医学检测
✓ 已验证
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2014
·Vol. 2
·期 38
·15931-15937
·
IF 0
Zhongyang Zhang,Qingzhong Xue,Yonggang Du,Cuicui Ling,Wei Xing
Graphene nanoribbons (GNRs) have been of great interest in a wide range of device applications for their novel physical, electronic and spin transport properties. Here we study the hydrogen (H2) sensing properties of GNRs decorated with palladium (Pd) nanoparticles by a one-step chemical modification and reduction process. A novel Pd-GNR film/SiO2/Si structure was fabricated by transferring a Pd-GNR film onto a heavily doped Si substrate with a native oxide layer. It is demonstrated that the Pd-GNR film/SiO2/Si structure exhibits highly enhanced responses to H2 than the pristine Pd-GNR film at parts-per-million (ppm) concentration levels at room temperature. For example, the Pd-GNR film/SiO2/p-Si structure shows an excellent response (ΔR/Rair) of ∼94% to 100 ppm H2 in air. The sensing mechanism was proposed to explain these H2 sensing characteristics based on p–n junction theory. Our findings demonstrate the incorporation of nanoparticles in GNR-based gas sensors through chemical functionalization and present a novel strategy for the application of GNRs in high performance gas sensors.
研究领域:
材料科学
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传感器技术
·
纳米科技
✓ 已验证
DOI
危险品化学品经营许可证（带存储）