TiO2hierarchical nano blooming-flower decorated by Pt for formaldehyde detection

Yankun Tang; Ming Zhang; Sher Ali Nawaz; Xianqing Tian; Hairong Wang; Jiuhong Wang

doi:10.1088/1361-6528/ac056c

TiO₂hierarchical nano blooming-flower decorated by Pt for formaldehyde detection

Nanotechnology. 2021 Jun 17;32(36). doi: 10.1088/1361-6528/ac056c.

Authors

Yankun Tang^{1

2}, Ming Zhang^{1

2}, Sher Ali Nawaz^{1

2}, Xianqing Tian³, Hairong Wang^{1

2}, Jiuhong Wang¹

Affiliations

¹ School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi, 710049, People's Republic of China.
² State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi, 710049, People's Republic of China.
³ China Academy of Engineering Physics, Institute of Chemical Materials, 64 Mianshan Road, Mianyang, Sichuan, 621900, People's Republic of China.

PMID: 34038880
DOI: 10.1088/1361-6528/ac056c

Abstract

To achieve an ultra-low concentration formaldehyde detection at low temperature, a platinum (Pt) assisted TiO₂hierarchical nano blooming-flower sphere material is synthesized through hydrothermal method. SEM and transmission electron microscope characterizations show that the diameter of the nano sphere was around 2μm with dissilient rods of 60 nm in diameter and 1μm in length on the surface. The response (R_a/R_g) achieved form this nanomaterial to HCHO is 1.08 (100 ppb) and 5.82 (5 ppm) at 130 °C without an involvement of any light source or solution. The relationship curve between the responses and concentrations shows regular exponential trend. The verification of sensor stability done by a 3 month reliability test shows no response-degradation. The optimal response and stability is attributed to the massive dissilient rods on the surface of TiO₂spheres and the assistance of Pt as a catalyzer disperses to intensify the formation of depletion area on the surface of TiO₂. This study provide an attractive and cost effective solution for the detection of HCHO in air at a relatively low temperature.

Keywords: formaldehyde (FA/CH2O); gas sensor; metal oxide semiconductor material; platinum; titanium dioxide.