Rapid and selective detection of acetone using hierarchical ZnO gas sensor for hazardous odor markers application.
J Hazard Mater
; 276: 262-70, 2014 Jul 15.
Article
em En
| MEDLINE
| ID: mdl-24892776
ABSTRACT
Hierarchical nanostructured ZnO dandelion-like spheres were synthesized via solvothermal reaction at 200°C for 4h. The products were pure hexagonal ZnO with large exposure of (002) polar facet. Side-heating gas sensor based on hierarchical ZnO spheres was prepared to evaluate the acetone gas sensing properties. The detection limit to acetone for the ZnO sensor is 0.25ppm. The response (Ra/Rg) toward 100ppm acetone was 33 operated at 230°C and the response time was as short as 3s. The sensor exhibited remarkable acetone selectivity with negligible response toward other hazardous gases and water vapor. The high proportion of electron depletion region and oxygen vacancies contributed to high gas response sensitivity. The hollow and porous structure of dandelion-like ZnO spheres facilitated the diffusion of gas molecules, leading to a rapid response speed. The largely exposed (002) polar facets could adsorb acetone gas molecules easily and efficiently, resulting in a rapid response speed and good selectivity of hierarchical ZnO spheres gas sensor at low operating temperature.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Contexto em Saúde:
1_ASSA2030
Base de dados:
MEDLINE
Assunto principal:
Acetona
/
Óxido de Zinco
/
Substâncias Perigosas
/
Odorantes
Tipo de estudo:
Diagnostic_studies
/
Risk_factors_studies
Idioma:
En
Revista:
J Hazard Mater
Ano de publicação:
2014
Tipo de documento:
Article