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Sub-ppm detection of gold nanoparticle transducer toward carboxyl functionality
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- Authors
- Young Jun Kim, S.M. Cho, Hyeon-Bong Pyo, Chang Auck Choi
- Issue Date
- 2005-11
- Citation
- SENSORS 2005, pp.845-848
- Language
- English
- Type
- Conference Paper
- Abstract
- Gold nanoparticles functionalized with methyl 3-mercaptopropionate (MMP) were synthesized and used as sensor materials to detect acetic acid in the sub-ppm range. The success of the MMP gold nanoparticles was confirmed by high resolution TEM and FTIR. The average diameter was characterized by TEM to be 3.1 nm. Transducer film was formed on a glass or a silicon substrate mounted with interdigitated gold electrodes. Highly porous morphology with sub-micron porosity was observed by SEM images of the nanoparticle film. The nanoparticle sensor was able to reproducibly detect around 50 ppb of acetic acid. Moreover linear relationship between response amplitude and analyte concentration was observed at least from 40 ppb to 2000 ppb. © 2005 IEEE.
- KSP Keywords
- Acetic acid(AA), Average diameter, High resolution TEM, Highly porous, Interdigitated gold electrodes, Methyl 3, Nanoparticle films, Porous morphology, SEM images, Sensor material, Silicon substrate