SENSORS AND ACTUATORS B-CHEMICAL
·
2015
·
IF 4.097
Yang Li,Kaicheng Fan,Huitao Ban,Mujie Yang
An impedance-type humidity sensor was prepared by sequentially depositing the thin films of crosslinked and quaternized poly(4-vinylpyridine) (QC-P4VP) and reduced graphene oxide (RGO) onto interdigitated gold electrodes. The QC-P4VP/RGO bilayer sensor reveals much lower impedance than QC-P4VP based sensor in the environments with low relative humidity (RH) levels, and could detect ultra-low humidity (0.18%RH) with very high response magnitude (impedance increase of 500% between 2.1%RH and 0.18%RH) at room temperature. Moreover, the bilayer sensor shows small hysteresis (∼4.5%RH) and fast response ( t 90% of 21 s and 78 s for adsorption and desorption processes, respectively). The effect of the concentration of RGO precursor, the deposition order and thickness of the sensing films, temperature, and the structure of the electrodes on the humidity sensing behaviors of the bilayer-structured sensors has been thoroughly examined, and the humidity sensing mechanism was explored.
研究领域:
材料科学
·
传感器技术
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Yueying Gao,Weiwei Meng,Ling Wang,Yuehua Li,Lei Dai
Salt melt synthesis is a kind of inorganic material synthesis method developed in modern times, which has certain potential advantages and development prospects. The sensing electrode (SE) material In 2 O 3 was synthesized by the salt melt method. The composition and morphology of the synthesized products under different conditions were studied in detail by combining XRD , SEM and TEM characterization. The results show that the salt melt method can facilely synthesize high-purity In 2 O 3 powder at a lower temperature, and its morphology changes regularly with the change of reaction conditions. The effects of synthesis times and temperatures on the gas-sensing performance of In 2 O 3 were discussed. The sensor based on In 2 O 3 (380 °C − 30 min)-SE exhibited superior gas-sensing performance in the range of NH 3 concentration of 50–500 ppm. The NH 3 response characteristics exhibited little effect at different relative humidity (RH) and oxygen partial pressure conditions. In addition, the sensor exhibited good repeatability and selectivity .
研究领域:
材料科学
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传感器技术
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无机合成
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气体传感
·
功能材料
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2014
·
IF 3.84
Qionghua Zhu,Feng Gao,Yizhen Yang,Bin Zhang,Wei Wang,Zhengshui Hu,Qingxiang Wang
A highly sensitive impedimetric DNA biosensor based on rod-like bismuth sulfide nano (rBi 2 S 3 ) and polyaniline (PANI) nanocomposite film modified ionic liquid-carbon paste electrode (IL-CPE) has been developed. The rBi 2 S 3 particles were first dropt on IL-CPE that was constituted with 1-butyl-3-methylimidazolium hexafluorophosphate (BMIMPF 6 ) and graphite powder, and then the PANI polymer was deposited on the surface of rBi 2 S 3 through potentiodynamic polymerization using aniline as the source, forming the PANI capped Bi 2 S 3 nanocomposite. The morphologies and electrocatalytic property of the composite were characterized by scanning electron microscopy (SEM) and electrochemical techniques including electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV), respectively. The integrated advantages such as the large surface area, excellent electronic conductivity, easy to fabrication, and good biocompatibility make the electrode favorable for DNA immobilization and hybridization detection. It was found that remarkable increase of electrochemical impedance was observed after the probe DNA modified electrode was hybridized with the target DNA. The dynamic detection range was determined to be from 1.0 × 10 −15 to 1.0 × 10 −11 M with a detection limit of 4.37 × 10 −16 M. The DNA biosensor also displayed good regeneration ability, reproducibility and stability.
研究领域:
材料科学
·
电化学
·
生物传感器
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Cheng-Tao Li,Meng-Xiao Chong,Le-Xi Zhang,Bo Tang,Li-Jian Bie
Halide perovskite (HP) materials have attracted much attention in recent years in the fields of smart home and medical detection due to their low fabrication cost, simple preparation process, controllable properties, and adjustable morphology. However, the inherent instability and toxicity of lead has been barriers limiting the practicality in electronical devices. Here, we demonstrate a high-performance impedimetric humidity sensor based on an all-inorganic lead-free HP Cs 2 TeBr 6 for the first time. The Cs 2 TeBr 6 sensor achieves ultra-high response value of 5 orders of magnitude (8.89 × 10 5 ) at 11–97 % relative humidity (RH), short response time (4 s), favorable repeatability, and good long-term stability. Moreover, high humidity sensing performance enables the Cs 2 TeBr 6 sensor to enjoy great potentials in real-time touchless human breath and finger detections. In addition, the mechanism of moisture sensitivity is explained by complex impedance spectra at different humidity levels. This work contributes an attracting candidate material for humidity sensors, and furthermore provides new insights into next-generation sensory devices using lead-free HPs for human-related detections.
研究领域:
材料科学
·
电子学
·
传感器
·
医疗检测
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智能家居
✓ 已验证
DOI
高影响因子
MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 12
·1-12
·
IF 5.3
Wang Yisi,Zhang Junying,Lv Xinxin,Ding Ya,Wang Yaolong,Liu Yuanhua,Wu Chunyong,Yang Gongjun
A highly sensitive and selective label-free impedimetric immunosensor based on AuNPs@pDA@NiCo 2 S 4 @MoS 2 nanocomposite modified on the surface of a screen-printed electrode (SPE) was designed for the detection of interleukin-6 (IL-6). The distribution of NiCo 2 S 4 nanoparticles on MoS 2 nanosheets was able to prevent them from agglomerating. The polydopamine (pDA) layer was coated on the surface of NiCo 2 S 4 @MoS 2 nanosheets by self-polymerization, which improved the stability and biocompatibility of the nanomaterial. The excellent reduction ability of pDA promoted the synthesis of gold nanoparticles (AuNPs), which increased the amount of antibody adsorption and the conductivity of the material. Finally, the antibody (Ab) of IL-6 was immobilized on the surface of AuNPs@pDA@NiCo 2 S 4 @MoS 2 nanocomposite. Electrochemical impedance spectroscopy (EIS) was used to detect the change of impedance before and after the immune response between Ab and IL-6 antigen (IL-6). Under the optimal experimental conditions, the relative change in impedance and the logarithmic concentration of IL-6 showed a good linear relationship in the range 1.00 to 1.00 × 10 6 pg/mL, with a low detection limit of 0.97 pg/mL. In addition, the proposed immunosensor performed with good reproducibility, stability, and specificity. It was successfully applied to the determination of IL-6 in patient’s serum samples of head and neck carcinoma with recoveries of 98.40% to 106.5%. To sum up, the proposed label-free impedimetric immunosensor was successfully constructed for IL-6 detection in real samples. Graphical abstract
研究领域:
生物化学
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生物技术
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分析化学
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材料科学
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医学诊断
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）