DNA gold nanoparticle nanocomposite films for chemiresistive vapor sensing.
Langmuir
; 29(46): 14335-43, 2013 Nov 19.
Article
em En
| MEDLINE
| ID: mdl-24111781
ABSTRACT
Chemiresistive vapor sensors combining functionalized gold nanoparticles and single-stranded DNA oligomers are investigated to enhance specificity in chemical sensing. Sensors are made by depositing DNA-functionalized gold nanoparticles onto microfabricated electrodes using four distinct sequences. Sensor performance is evaluated for response to relative humidity and exposure to vapor analytes including ethanol, methanol, hexane, dimethyl methylphosphonate, and toluene under different relative humidity. It is found that sensors display a nonmonotonic resistance change toward increasing humidity due to the combined effects of hydration induced swelling and ionic conduction. Responses to vapor analytes show sequence-dependent patterns as well as a strong influence of humidity. Overall, the findings are encouraging for using DNA oligomers to enhance specificity in chemical sensing.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
DNA de Cadeia Simples
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Técnicas Biossensoriais
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Nanocompostos
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Nanopartículas Metálicas
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Ouro
Idioma:
En
Revista:
Langmuir
Assunto da revista:
QUIMICA
Ano de publicação:
2013
Tipo de documento:
Article
País de afiliação:
Estados Unidos