ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Wei Liu,Ding Gu,Xiaogan Li
A novel chemiresistive-type sensor for detecting sub-ppm NO2 has been fabricated using AuPt bimetal-decorated SnSe2 microflowers, which was synthesized by the hydrothermal treatment followed by in situ chemical reduction of the bimetal precursors on the surface of the petals of the microflowers. The as-prepared sensor registers a superior performance in detection of sub-ppm concentration of NO2. Functionalized by the AuPt bimetal, the SnSe2 microflower-based sensor shows a response of approximately 4.62 to 8 ppm NO2 at 130 °C. It is significantly higher than those of the sensors using the pristine SnSe2 (∼2.29) and the modified SnSe2 samples by a single metal, either Au (∼3.03) or Pt (∼3.97). The sensor demonstrates excellent long-term stability, signal repeatability, and selectivity to some typical interfering gaseous species including ammonia, acetone, formaldehyde, ethanol, methanol, benzene, CO2, SO2, and CO. The remarkable improvement of the sensitive characteristics could be induced by the electronic and chemical sensitization and the synergistic effect of the AuPt bimetal. Density functional theory (DFT) is implemented to calculate the adsorption states of NO2 on the sensing materials and thus to possibly reveal the sensing mechanism. The significantly enhanced response of the SnSe2-based sensor decorated with AuPt bimetallic nanoparticles has been found to be possibly caused by the orbital hybridization of O, Au, and Pt atoms leading to the redistribution of electrons, which is beneficial for NO2 molecules to obtain more electrons from the composite material.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
DOI
PubMed
高影响因子
MATERIALS LETTERS
·
2021
·
IF 3.423
Jing Sun,Wei Xiong,Jiawei Zhang,Yong Zhang,Bin Xie
The power consumption of the chemical resistive gas sensor should be considered when its performance is developed. One of the most effective methods for reducing the power consumption is to make the gas sensor work at room temperature. A tin disulfide (SnS 2 ) nanoparticle-based gas sensor with high sensitivity and fast recovery is proposed in this paper for detecting the nitrogen dioxide (NO 2 ). The experimental results show that the SnS 2 nanoparticle-based gas sensor has excellent gas sensing performance at room temperature, including high sensitivity, rapid response/recovery speed (28 s/1 s), high selectivity and good repeatability and reversibility. The main reason for the excellent performance of the SnS 2 nanoparticle-based gas sensor is mainly attributed to the unique physical affinity and favorable electronic band positions of the SnS 2 material, which promotes the physisorption and charge transfer of NO 2 gas molecules. It is expected that this work can provide guidance for the real-time rapid detection of NO 2 at room temperature.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Zhaorui Zhang,Jiahao Liu,Haiying Du,Xufei Zhao,Haoming Sun,Minghui Yang,Jinkui Chu
A surface functional group modulation method was used to regulate the NO 2 sensing performance of the Ti 3 C 2 T x sensor. The monolayer Ti 3 C 2 T x MXene was synthesized from Ti 3 AlC 2 (MAX phase) by hydrofluoric acid (HF) etching. Ar/O 2 hybrid plasma treatment was used to regulate the ratio of hydroxyl and fluorine functional groups (OH/ F) in the Ti 3 C 2 T x surface structure. Room-temperature (RH) NO 2 sensor based on modified Ti 3 C 2 T x was fabricated by the dip coating method. The modified Ti 3 C 2 T x sensor has a higher gas response (45.31 %) to 50 ppm NO 2 compared with the untreated Ti 3 C 2 T x sensor which shows more excellent sensitivity and linearity with the NO 2 concentration of 5–50 ppm. It is due to that the presence of the hydroxyl potential on the Ti 3 C 2 T x surface well amplifies the electronic surface activity of Ti 3 C 2 T x . Concurrently, the modified electronic structure augments the adsorption propensity of Ti 3 C 2 T x for O 2 (2.26 |eV|) and NO 2 (3.24 |eV|), thereby improving the NO 2 sensing capability of the Ti 3 C 2 T x sensor. These results demonstrate that Ti 3 C 2 T x with a high ratio of OH/ F functional groups has great potential in developing high-performance room temperature NO 2 sensors.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Ji Li,Ming Yang,Xiaoli Cheng,Xianfa Zhang,Chuanyu Guo,Yingming Xu,Shan Gao,Zoltán Major,Hui Zhao,Lihua Huo
In order to challenge high working temperature, low response and low selectivity of present NO 2 sensor, porous SnO 2 nanotoasts with a large surface area (79.94 m 2 /g) were synthesized. Thick film sensors fabricated by the SnO 2 nanotoasts exhibited a high response to NO 2 gas operating at room temperature. Excellent performance for NO 2 sensing gas at 50 °C, included the high response of 105.2 (10 ppm), low detection limitation of 0.1 ppm, fast response within 10 s, and wide range of 0.1–10 ppm (R 2 = 0.9931). These sensors also demonstrated perfect selectivity, moisture resistance and 90 days of long-term stability. SnO 2 nanotoasts sensor has excellent detection ability in actual detection. The superior response of porous SnO 2 nanotoasts towards NO 2 was attributed to the special porous structure with large specific surface area and oxygen vacancies in sensing material, which helped adsorption of the target gas molecules onto the sensing surfaces and transfer of the charge.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2017
·
IF 2.843
Yi Zhao,Han Wang,Siqi Hao
Molecularly imprinted polymers (MIP1 and MIP2) were synthesized using acrylamide as the functional monomer and acetic acid and ethanedioic acid as the template, respectively. Textural properties of MIPs and nonimprinted polymer (NIP) were characterized by an N2 adsorption experiment, thermogravimetric analysis, and Fourier transform infrared spectroscopy. NO2 basic adsorption conditions were set as 40 °C for the temperature, 100 mL/min for the flow rate, and 1000 ppm for the NO2 concentration through fixed-bed breakthrough experiments, and at these conditions, the NO2 adsorption capacity of MIP1, MIP2, and NIP was 0.58, 0.63, and 0.51 mg/g, respectively. The NO2 adsorption performance was nearly unaffected by O2; however, SO2 and CO2 inhibited NO2 adsorption severely. The H2O molecule had fewer negative effects on NO2 adsorption because of the large number of hydrophobic groups −(CH2–CH)n– in polymers and the hydrogen bond force between H2O molecules.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sensors
·
2025
·
IF 9.1
Wenbin Ren,Jinfeng Luan,Liang Yin,Huijuan Chen,Changchun Wang,Pinhua Zhang,Guangliang Cui,Li Lv
The development of real-time trace-level NO2 quantification platforms that can be operated at room temperature constitutes a critical advancement for occupational safety and public health monitoring systems. This study demonstrates a room-temperature NO2 sensor using MXene–Cu2O composites prepared via a hydrothermal method. Systematic evaluation of MXene-introduced effects identified the 0.84 wt % MXene–Cu2O composite as optimal, exhibiting 4-fold enhanced sensitivity and shorter response (55 s)/recovery (35 s) time compared to pure Cu2O. Additionally, the sensor exhibits a low detection limit (10 ppb), high selectivity, great reversibility, and long-term stability. The enhanced sensing performance originates from precisely engineered interfacial architectures between MXene and Cu2O, which effectively adjust the charge-transfer behavior through the conduction tunnel in the sensing material. Furthermore, oxygen vacancy engineering creates defect-mediated adsorption centers that promote selective NO2 chemisorption through charge polarization effects. This research offers a novel strategy for designing optimized structures to enhance the sensitivity of MOS-based materials for NO2 gas detection.
研究领域:
材料科学
·
环境监测
·
化学传感器
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Di Liu,Zilong Tang,Zhongtai Zhang
SnS 2 is a promising candidate for NO 2 sensing applications due to its suitable band gap and large electronegativity. However, SnS 2 based gas sensors are still restricted to detect NO 2 gas at room temperature due to their giant resistance and poor recovery. Here, we report hollow SnO 2 @SnS 2 nanostructures prepared by a one-step hydrothermal method. The SnO 2 @SnS 2 based sensor showed high response and good recovery to ppb-level NO 2 under visible illumination at room temperature (25 °C). The superior sensing performance of the SnO 2 @SnS 2 sensor was attributed to the hollow porous heterojunction structure beneficial for gas diffusion, as well as visible light assistant facilitating charge transfer and gas desorption. This work systematically studied the influence of oxygen concentration in background gas on the NO 2 sensing performance of the SnO 2 @SnS 2 sensor, and proposed a physical adsorption model for the NO 2 sensing mechanism of the SnO 2 @SnS 2 sensor under visible light at room temperature. In addition, the effect of humidity on the gas sensing performance of the SnO 2 @SnS 2 sensor to different concentrations of NO 2 was also discussed.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Lu Wang,Lijuan Wang,Ziyang Cui,Yiqun Zhang
In order to achieve high sensitivity in gas-sensors based on organic field-effect transistors (OFETs), the most crucial and direct approach to enhance their sensing performance and reduce response and recovery times was through appropriate modification or improvement of the organic semiconductor (OSCs) layer, such as altering its surface morphology or structure. The micro/nano structure of spin-coated copper phthalocyanine (CuPc) films was controlled by utilizing polyvinyl alcohol ordered nanofibers (PVA ONFs). The electrical and gas-sensitive properties of CuPc/PVA ONFs films were investigated and analyzed. The CuPc/PVA ONFs film transistors exhibited improved output and transfer characteristics when the CuPc solution concentration was 75 mg/mL, with a mobility (μ) of 6.90 × 10-4 cm2/Vs. Compared with the spin-coated CuPc film transistors, the mobility increased by 74.24%. The sensors demonstrated the relative response of 12,942 % to 20 ppm NO2 gas. Additionally, it showed the response time of 1.49 min and recovery time of 2.32 min. The response rate reached up to 90 %, while the sensitivity was measured at 611 %/ppm, and the limit of detection (LOD) stood at 0.2 ppm. The research presented in this paper advances the potential applications of phthalocyanine materials within the realm of flexible and 3D-printed sensing technologies.
研究领域:
材料科学
·
传感器技术
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Hang Liu,Junlong Liu,Yanchang Liu,Zhihao Qu,Siye Tian,Yuhong Zhang
In this work, the ZnO microsphere is prepared by hydrothermal method and modified with different concentrations of Eu. The morphology of ZnO:Eu sample shows flower-like microspheres with many nanosheets. The gas performance of ZnO:Eu microsphere is investigated for detecting NO 2 . Compared with pure ZnO, the response of ZnO:2 % Eu sensor is increased by 8 times, and the optimal operating temperature of that is decreased to 130 °C. Especially, the gas sensing properties of ZnO:2 % Eu sensor is enhanced under UV excitation. The recovery time of ZnO:Eu sensor is reduced by 1200 s, and the response is increased by 3.6 times under UV excitation. The above results show an increase in sensor response due to doping Eu and UV excitation. At last, the possible gas mechanism of ZnO:Eu is discussed with and without UV excitation. This finding provides important guidance for UV-assisted sensors to enhance NO 2 response.
研究领域:
材料科学
·
环境监测
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 1
·390-395
·
IF 2.936
Xianwei Fu,Shilong Jiao,Ning Dong,Gang Lian,Tianyu Zhao,Song Lv,Qilong Wang,Deliang Cui
A room-temperature NO2 gas sensor with excellent performances is fabricated using an MAPbI3 (MA = CH3NH3+) thin film. It presents a high response even under extremely low NO2 concentrations. Its average response and recovery times are only ∼5 s and ∼25 s at room temperature, respectively, exhibiting its quick-responsive character. In addition, the MAPbI3-based NO2 sensor exhibits good selectivity. Interestingly, the sensitivity of the MAPbI3-based NO2 sensor is strikingly improved under high-pressure gas conditions. This phenomenon can be used for the online monitoring of chemical reaction processes and in situ detection of trace-level gas impurities under high-pressure conditions. Furthermore, based on theoretical calculations, a simple model is proposed to illustrate the corresponding gas-sensing mechanism.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Arabian Journal of Chemistry
·
2024
·
IF 5.3
Jiyun Gao,Youyou Yin,Yongjing Guo,Lijuan Jia,Futing Xia,Chenhui Liu,Ming Hou,Fang Wang
NO 2 is a toxic gas that poses a significant threat to the environment and human health. In this work, one-dimensional ZnO nanowires and two-dimensional layered titanium carbide (Ti 3 C 2 T x ) have been prepared by hydrothermal and selective chemical etching methods, respectively. The Ti 3 C 2 T x /ZnO composites are synthesized by electrostatic self-assembly method. The characterization results indicate that the ZnO nanowires are uniformly dispersed on the surface of layered Ti 3 C 2 T x to form a heterostructure. Meanwhile, the gas sensitive performance of Ti 3 C 2 T x /ZnO composite material is investigated and compared with that of pure Ti 3 C 2 T x . The results reveal that the composite exhibits a high selectivity as well as sensitivity with a response value (S = Rg/Ra) of 18.66 to 100 ppm NO 2 at 250 ℃, which is 4.3 times higher than that of pure Ti 3 C 2 T x . This proves that the prepared composite material is an effective sensing material for detecting NO 2 gas.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2024
·Vol. 171
·期 7
·077514
·
IF 3.1
Tengteng Zhao,Chaoyu Wang,Lei Dai,Weiwei Meng,Yongguang Liu,Yuehua Li,Ling Wang
NO2 is an important pollutant of automobile engines and industrial fuels, making it important to quantitatively monitor and control. An amperometric-type NO2 gas sensor was fabricated using yttria-stabilized zirconia (YSZ) electrolyte with a bi-layered structure and La0.7Sr0.3MnO3−δ-xNiO (LSMO-xNiO, x = 0–0.75) composite sensing electrode (SE) prepared by impregnation method in combination with self-demixing. The samples were characterized using SEM, XRD, and XPS, and their performance as sensors was tested. LSMO-xNiO composite SE particles were formed by de-mixing in the process of treating the precursor at high temperatures and are uniformly dispersed in the YSZ porous backbone. With the increase of NiO content, the SE particles become significantly large. At 450 °C–600 °C, the response currents at a fixed potential have a linear relationship with the NO2 concentrations at 25–700 ppm. Combining stability and sensitivity, the voltage was fixed to −0.25 V. The introduction of NiO into the LSMO sensing electrode effectively improves the performance of the sensor. The sensor based on LSMO-0.5NiO has the highest sensitivity (0.0405 μA/ppm) at 550 °C. Simultaneously, the sensor exhibits good anti-interference ability for CH4, CO2, O2, and NO, but has obvious cross-sensitivity to H2 and NH3. In addition, the response current of the sensor change with the increase of RH.
研究领域:
材料科学
·
环境监测
·
传感器技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）