OSA's Digital Library

Applied Spectroscopy

Applied Spectroscopy

| PUBLISHED BY SAS — AVAILABLE FROM SAS AND OSA

  • Vol. 64, Iss. 2 — Feb. 1, 2010
  • pp: 211–218

Surface-Controlled Electroless Deposition Method in the Preparation of Stacked Silver Nanoparticles on Germanium for Surface-Enhanced Infrared Absorption Measurements

Ruo-Lan Joan Chang and Jyisy Yang

Applied Spectroscopy, Vol. 64, Issue 2, pp. 211-218 (2010)


View Full Text Article

Acrobat PDF (888 KB)





Browse Journals / Lookup Meetings

Browse by Journal and Year


   


Lookup Conference Papers

Close Browse Journals / Lookup Meetings

Article Tools

Share
Citations
  • Export Citation/Save Click for help

Abstract

A new method to prepare highly sensitive sensing elements for surface-enhanced infrared absorption (SEIRA) measurements was investigated. A surface-controlled procedure was employed to grow round and stacked silver nanoparticles (Ag-NPs) on germanium substrates. In this method, an initial layer of Ag-NPs was prepared using a common method of electroless deposition. After subsequently placing a controlled layer of p-aminothiophenol (pATP) on the surface of the initial layer of Ag-NPs, the substrates were placed in a silver nitrate solution to grow a second layer of Ag-NPs. By repeating these growing procedures, multi-layers of stacked Ag-NPs can be obtained. To examine the influence of morphology of the formed Ag-NPs on the resulting SEIRA signals, the factors affecting the reactions were systematically examined. These factors included the concentrations of silver nitrates, the reaction times to prepare both the initial layer and the second layer of Ag-NPs, and the coverage of pATP. Results indicate that the Ag-NPs making up the second layer were round in shape and much more densely distributed than those in the initial layer. The observed SEIRA spectra did not show derivative-shaped absorption bands for pATP on the Ag-NPs after re-growth, indicating that pATP was sandwiched between the two layers of Ag-NPs, preventing the nanoparticles from coming into direct contact with one another. Also, the SEIRA signals of the controlled molecules between the particles were found to be two to five times more intense than the signals before growing another layer of Ag-NPs. The reaction conditions can be adjusted to vary the morphology and thickness of the Ag-NP layers, and, by repeating the growing procedures, a thick layer of stacked Ag-NPs with suitable size for SEIRA measurements can be obtained that is highly suited to chemical sensing applications.

Citation
Ruo-Lan Joan Chang and Jyisy Yang, "Surface-Controlled Electroless Deposition Method in the Preparation of Stacked Silver Nanoparticles on Germanium for Surface-Enhanced Infrared Absorption Measurements," Appl. Spectrosc. 64, 211-218 (2010)
http://www.opticsinfobase.org/as/abstract.cfm?URI=as-64-2-211

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Log in to access OSA Member Subscription

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Log in to access OSA Member Subscription

« Previous Article  |  Next Article »

OSA is a member of CrossRef.

CrossCheck Deposited