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Novel Self-Assembly Route Assisted Ultra-Fast Trace VOCs Gas Sensing Based on 3D Opal Microspheres Composites for Diabetes Diagnosis.
ACS Appl Mater Interfaces. 2018 Sep 03;:
Authors: Wang T, Zhang S, Yu Q, Wang S, Sun P, Lu H, Liu F, Yan X, Lu G
Abstract
The development of ultra-fast response semiconductor gas sensors for high accuracy detection of trace volatile organic compounds (VOCs) in human exhaled breath still remains challenge. Herein, we proposed a novel self-assembly synthesis concept for preparing intricate 3D opal porous (OP) SnO2-ZnO hollow microspheres (HM), by employing sulfonated polystyrene (S-PS) spheres template assisted ultrasonic spray pyrolysis (USP). Due to the high gas accessibility of the unique opal hollow structures, the existence of three-dimensional interconnection and bimodal (mesoscale and macroscale) pores, and the n-n heterojunction-induced change in oxygen adsorption. The 3D OP SnO2-ZnO HM sensor exhibited high response and ultra-fast dynamic process (response time ~4 s and recovery time ~17 s) to 1.8 ppm acetone under highly humid ambient (98% RH), and it could rapidly identified the states of the exhaled breath of healthy people and simulated diabetics. In addition, the rational structure design of the 3D OP SnO2 HM that enables the ultra-fast detection (within 1 s) of ethanol in simulation drunk driving testing. Our results obtained in this work provided not only a facile self-assembly approach to fabricate metal oxides with 3D OP HM structures but also a new methodology for achieving noninvasive real-time exhaled breath detection.
PMID: 30176721 [PubMed - as supplied by publisher]