For NO 2 , a gas that is widely used and harmful, domestic and foreign researchers have done a lot of work to develop a sensor with low detection limit and low humidity sensitivity to achieve efficient detection of NO 2 . In this work, first of all, dense and uniform SnO 2 nanosheets were grown in situ on the surface of Al 2 O 3 ceramic tube by hydrothermal method. Then, the ZIF-8@SnO 2 porous composite gas-sensitive material was constructed by solvent thermal method. With the advantages of the ZIF-8 porous screening framework, the permeation of different gases can be selectively controlled, and the adsorption efficiency of NO 2 gas can be enhanced through the modification of ammonia to improve the selectivity of NO 2 . The results show that the response of the Modified-ZIF-8@SnO 2 sensor is significantly enhanced, and the selectivity is greatly improved at low operating temperature. At 140 °C, the response of Modified-ZIF-8@SnO 2 to 50 ppm NO 2 gas is as high as 61, which is about 18.4 times higher than that of SnO 2 nanosheets and about 16.3 times higher than that of ZIF-8@SnO 2 . Meanwhile, the anti-interference ability of the Modified-ZIF-8@SnO 2 sensor to humidity has been improved. This work provides a new idea for improving the selectivity and humidity insensitivity of gas sensors.
Graphical Biosensors Based on MXene Composite : A novel ammonia modified MXene/aniline copolymer (PTA) was prepared via electropolymerization with the rose-like N-Ti 3 C 2 T x and aniline. PTA has a network structure and excellent electrochemical performance. Fabricated PTA/GCE sensor has been used to detect GSH with high stability and sensitivity, and it was applied for rapidly detect GSH in real samples with excellent recoveries. Herein, unique ammonia modified MXene/aniline copolymers (PTA) are prepared by facile and green electropolymerization with the rose-like ammonia modified MXene (N-Ti 3 C 2 T x ) and aniline to modify electrochemical sensor to detect GSH with high performance. Scanning electron microscopy (SEM), cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and differential pulse voltammetry (DPV) characterizations show that the PTA copolymer exhibits a net-like structure and excellent electrochemical performance. It displays that the PTA can be regarded as an outstanding electrode nanomaterial for high-performance sensors. Moreover, the PTA/GCE biosensor is fabricated through one-step electropolymerization method for detecting glutathione. Under the optimum conditions, the limit of detection of the biosensor is calculated to be 5.21×10 −14 mol L −1 with a high sensitivity of 32.9 μA nmol −1 L cm −2 . At the same time, the biosensor displays excellent selectivity and stability. Furthermore, the fabricated PTA/GCE biosensor is applied to detect glutathione of plasma samples with good recoveries, indicating that the sensor has broad application prospects in the field of biological and medical analysis.
危险品化学品经营许可证（带存储）