The effective detection of formaldehyde is of great importance to people's daily life. Titanium oxide (TiO2) based nanomaterials have great promise for formaldehyde detection due to their wide availability, easy utilization and abundant surface reactions. However, currently their actual application is still limited by their relatively low sensitivity, high working temperature and poor selectivity. To address these issues, herein we develop a template-assisted self-assembly strategy to realize the simultaneous chemical doping and morphological control of TiO2nanostructures. The resultant Co-doped TiO2nanospheres show a cobalt content of up to 2.95 wt% and a unique raspberry-like mesoporous morphology composed of numerous superfine nanopores of 4.9-7.8 nm, which provides a large specific surface area (∼175 m2g−1) and high porosity (0.438 cm3g−1) to the product. The gas sensor device shows a sensitivity of ∼84.8 for 10 ppm formaldehyde, which exceeds that of most of the similar metal oxides reported recently and likely stands for the state-of-the-art merit of formaldehyde sensors. Meanwhile, the sensor also shows significantly decreased working temperature (∼86 °C) and unique selectivity. All this makes our chemically doped raspberry-like mesoporous TiO2product a very promising candidate for future formaldehyde sensors.
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Materials Science(all)