Rationally Designed TiO₂ Nanostructures of Continuous Pore Network for Fast‐Responding and Highly Sensitive Acetone Sensor

Abstract

For the last several years, indoor air quality monitoring has been a significant issue due to the increasing time portion of indoor human activities. Especially, the early detection of volatile organic compounds potentially harmful to the human body by the prolonged exposure is the primary concern for public human health, and such technology is imperatively desired. In this study, highly porous and periodic 3D TiO2 nanostructures are designed and studied for this concern. Specifically, extremely high gas molecule accessibility throughout the whole nanostructures and precisely controlled internecks of 3D TiO2 nanostructures can achieve an unprecedented gas response of 299 to 50 ppm CH3COCH3 with an extremely fast response time of less than 1s. The systematic approach to utilize the whole inner and outer surfaces of the gas sensing materials and periodically formed internecks to localize the current paths in this study can provide highly promising perspectives to advance the development of chemoresistive gas sensors using metal oxide nanostructures for the Internet of Everything application.

Atomically mixed catalysts on a 3D thin-shell TiO2 for dual-modal chemical detection and neutralization

“…S13 †) for the experiment because of its suitable porosity for effective gas diffusion. 24,55 To further verify the role of each metal element in the transition of selectivity of gas detection, the gas responses to VOCs (10 ppm of NO 2 , NH 3 , C 7 H 8 , H 2 S, C 6 H 6 , and C 3 H 6 O) were analyzed (Fig. 4a-d and S15 †).…”

A theoretical study on the surface reaction of tetrakis(dimethylamino)titanium on titanium oxide

“…The ALD of titanium oxide (TiO 2 ) has been extensively studied for various applications, such as catalysis, 3–5 photovoltaic devices, 6–8 photoelectrolysis, 9,10 photochemical hydrogen production, 11,12 sensors, 13–15 and high- k dielectrics. 16 In particular, a low-temperature ALD process is required for applications involving substrates that are sensitive to high temperatures, such as flexible displays, 17 or biomaterial functionalization.…”

Heterojunction-Engineered Reduced Graphene Oxide/SnO2 with Mesoporous Structures for Gas Chemosensors

“…Owing to their excellent chemical stability and electronic properties, , semiconducting metal oxides have been widely investigated for photocatalysis, , solar cells, energy storage, sensors, − optoelectronic devices, , etc. Among them, SnO 2 is a versatile direct wide bandgap semiconducting material that is widely studied to make sensors for the detection of various VOCs, including organic amines such as TEA, diethylamine (DEA), and dimethylamine (DMA). − However, pristine SnO 2 requires high operating temperatures to detect these compounds with reasonable sensitivity and/or selectivity.…”