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Detection of organics in aqueous solution using gold nanoparticles modified with mixed monolayers of 1-hexanethiol and 4-mercaptophenol
- Source :
- Sensors and Actuators B: Chemical. 143:704-711
- Publication Year :
- 2010
- Publisher :
- Elsevier BV, 2010.
-
Abstract
- Gold nanoparticles functionalized with mixtures of 1-hexanethiol and 4-mercaptophenol were investigated as chemiresistor sensors for use in aqueous solutions. X-ray photoelectron spectroscopy (XPS) studies confirmed that it was possible to form mixed ligand compositions on the surface of the nanoparticles. Nanoparticle films with a higher proportion of 1-hexanethiol as the ligand resulted in higher impedances than those with lower proportions. The electrical response of the chemiresistor to toluene, dichloromethane, hexane and ethanol dissolved in water was found to depend strongly on the composition of the organic ligand used to cap the gold nanoparticles. 1-Hexanethiol-coated gold nanoparticles were sensitive to non-polar analytes whereas the sensitivity was reduced upon increasing the composition of 4-mercaptophenol on the surface. It was also shown that the sensitivity to ethanol could be enhanced 3-fold by using a sensor that was functionalized with a mixture of 60% 1-hexanethiol and 40% 4-mercaptophenol compared to a sensor functionalized with pure thiols only.
- Subjects :
- Chemiresistor
Aqueous solution
Metals and Alloys
Analytical chemistry
Nanoparticle
Self-assembled monolayer
Condensed Matter Physics
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
chemistry.chemical_compound
X-ray photoelectron spectroscopy
chemistry
Colloidal gold
Monolayer
Materials Chemistry
Electrical and Electronic Engineering
Instrumentation
Dichloromethane
Nuclear chemistry
Subjects
Details
- ISSN :
- 09254005
- Volume :
- 143
- Database :
- OpenAIRE
- Journal :
- Sensors and Actuators B: Chemical
- Accession number :
- edsair.doi...........79b56689cb3441df5773f3c8aa82d60a