Ultrastructural characterization of colloidal metal films for bioanalytical applications by scanning force microscopy

Date
1996
Authors
Fritzsche, Wolfgang
Sokolov, Konstantin
Chumanov, George
Henderson, Eric
Cotton, Therese
Henderson, Eric
Major Professor
Advisor
Committee Member
Journal Title
Journal ISSN
Volume Title
Publisher
Altmetrics
Authors
Research Projects
Organizational Units
Zoology and Genetics
Organizational Unit
Chemistry
Organizational Unit
Journal Issue
Series
Department
Zoology and GeneticsChemistry
Abstract

Colloidal metal films (CMFs) are prepared by the attachment of silver, gold, or platinum (or other metal) particles to a glass slide modified by silanization with 3‐mercaptopropyl silane. The covalent attachment of the metal particles occurs through the metal–sulfur bond. In these samples the local electromagnetic field is enhanced near the surface of the CMF due to excitation of plasmon resonances. This phenomenon can be used for a variety of analytical applications. Because the optical properties are strongly dependent on the morphology of the film, its structural characterization becomes of great importance. To further characterize CMFs we have used scanning force microscopy (SFM). Initial studies revealed lateral dimensions of the particles as well as the particle density. Height measurements were made using the three‐dimensional topographic image of the surface yielded by SFM, and were used to evaluate the selective deposition of a silica spacer layer onto the metal particles. Comparative SFM measurements in water and air using different imaging modes were performed to investigate the mechanical stability of CMFs against the forces exerted by the scanning tip.

Comments

This article is from Journal of Vacuum Science & Technology A 14 (1996): 1766, doi: 10.1116/1.580334. Posted with permission.

Description
Keywords
Citation
DOI
Collections