Detection of volatile organic compounds by surface enhanced Raman scattering

Chang A. S. P., Maiti A., İLERİ ERCAN N., Bora M., Larson C. C., Britten J. A., ...Daha Fazla

Advanced Environmental, Chemical, and Biological Sensing Technologies IX, Baltimore, MD, Amerika Birleşik Devletleri, 26 - 27 Nisan 2012, cilt.8366 identifier identifier

  • Yayın Türü: Bildiri / Tam Metin Bildiri
  • Cilt numarası: 8366
  • Doi Numarası: 10.1117/12.920847
  • Basıldığı Şehir: Baltimore, MD
  • Basıldığı Ülke: Amerika Birleşik Devletleri
  • Anahtar Kelimeler: nanostructures, sensing, spectroscopy, Surface Enhanced Raman Scattering
  • Orta Doğu Teknik Üniversitesi Adresli: Hayır

Özet

We present the detection of volatile organic compounds directly in their vapor phase by surface-enhanced Raman scattering (SERS) substrates based on lithographically-defined two-dimensional rectangular array of nanopillars. The type of nanopillars is known as the tapered pillars. For the tapered pillars, SERS enhancement arises from the nanofocusing effect due to the sharp tip on top. SERS experiments were carried out on these substrates using various concentrations of toluene vapor. The results show that SERS signal from a toluene vapor is strongly influenced by the substrate temperature, and the toluene vapor can be detected within minutes of exposing the SERS substrate to the vapor. A simple adsorption model is developed which gives results matching the experimental data. The results also show promising potential for the use of these substrates in environmental monitoring of gases and vapors. © 2012 SPIE.