Room-temperature high-selectivity NO2 sensor based on three-dimensional Ti3C2Tx/rGO composite folded ball and preparation method thereof

Abstract

The invention discloses a room-temperature high-selectivity NO2 sensor based on a three-dimensional Ti3C2Tx / rGO composite folded ball and a preparation method thereof, and belongs to the technical field of gas sensors. The sensor is composed of a polyimide substrate with an Au interdigital electrode and sensitive electrodes prepared on the interdigital electrode and the substrate. The three-dimensional Ti3C2Tx / rGO composite folded ball is synthesized by adopting an ultrasonic spray pyrolysis technology, and on the basis of forming an anti-aggregation pleated ball to reduce the loss of the specific surface area, a uniform rGO / TiO2 heterojunction is also formed on the folded ball, so that sensing sites are increased. The material shows the property of a p-type semiconductor, and the response direction of NO2 is opposite to that of VOCs and NH3, so that the selectivity of NO2 is further enhanced undoubtedly. Meanwhile, the three-dimensional Ti3C2Tx / rGO composite folded ball has higher NO2 response and lower detection limit compared with a pure Ti3C2Txfolded ball and a pure rGO folded ball.

Description

technical field [0001] The invention belongs to the technical field of gas sensors, in particular to a sensor based on three-dimensional Ti 3 C 2 T x / rGO composite wrinkled spheres with high selectivity for NO at room temperature 2 Sensor and preparation method, the sensor is based on three-dimensional Ti 3 C 2 T x / rGO composite wrinkle ball is a sensitive layer, mainly used for wearable nitrogen dioxide detection. Background technique [0002] MXenes refers to the family of two-dimensional transition metal carbides, nitrides and carbonitrides, the name comes from its preparation process and properties ("Two-Dimensional Nanocrystals Produced by Exfoliation of Ti 3 AlC 2 ", Michael Naguib et al., Advanced Materials, Volume 23, Issue 37, Pages 4248-4253, August 22, 2011). MXenes have the general formula M n+1 x n T z , T means such as O 2- , OH - , F - and Cl - surface group (M represents a transition metal element, X represents carbon or nitrogen). At present...

AI Technical Summary

Problems solved by technology

A large number of surface defects caused by oxidation are the main reason for the improvement of gas sensor response, but the improvement of gas sensor performance only stays at the response value, and there is still a lot of room for improvement in selectivity, response recovery efficiency, etc.

Images