Highly Sensitive Detection of Benzene, Toluene, and Xylene Based on CoPP-Functionalized TiO2 Nanoparticles with Low Power Consumption
| Autor: | Yeunjun Kwak, Yunsung Kang, Jongbaeg Kim, Byeonghwa Cho, Kwanhun Kim |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Fluid Flow and Transfer Processes
Microheater Bulk micromachining Materials science Process Chemistry and Technology 010401 analytical chemistry Inorganic chemistry Xylene chemistry.chemical_element Bioengineering 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Toluene 0104 chemical sciences chemistry.chemical_compound chemistry Titanium dioxide Surface modification 0210 nano-technology Benzene Instrumentation Cobalt |
| Zdroj: | ACS Sensors. 5:754-763 |
| ISSN: | 2379-3694 |
| DOI: | 10.1021/acssensors.9b02310 |
| Popis: | Among various metal oxides, titanium dioxide (TiO2) has received considerable interest as a gas-sensing material owing to its high reliability at high operating temperatures. Nonetheless, TiO2 generally has low sensitivity to target gases. In particular, TiO2-based sensors have difficulty in sensitively detecting benzene, toluene, and xylene (referred to as BTX). Moreover, the reported TiO2-based sensors have not simultaneously satisfied the demand for tens of ppb BTX detection and operation with low power consumption. This work proposes a BTX sensor using cobalt porphyrin (CoPP)-functionalized TiO2 nanoparticles as a sensing material on a suspended microheater fabricated by bulk micromachining for low power consumption. TiO2 nanoparticles show an enhanced sensitivity (245%) to 10 ppm toluene with CoPP functionalization. The proposed sensor exhibits high sensitivity to BTX at concentrations ranging from 10 ppm down to several ppb. The high reliability of the sensor is also explored through the long-time operation with repeated exposure to 10 ppm toluene for 14 h. |
| Databáze: | OpenAIRE |
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