Toward a thermally robust operando surface-enhanced raman spectroscopy substrate

Alyson V. Whitney, Jeffrey W. Elam, Peter C Stair, Richard P. Van Duyne

Research output: Contribution to journalArticle

83 Citations (Scopus)

Abstract

The work presented here describes the first steps toward designing a thermally robust surface-enhanced Raman spectroscopy (SERS) substrate with the potential to conduct in situ monitoring of catalytic reactions. Nanosphere lithography (NSL) fabricated SERS substrates were coated with thin (0.2-1.0 nm) films of atomic layer deposited (ALD) Al 2O 3. The thermal stability of these substrates was examined at various temperatures (100-500°C) and over time (up to 6 h) in nitrogen. The results showed that ALD Al 2O 3 coated nanoparticles maintained their original geometry significantly better than the bare Ag nanoparticles. While experiments showed that thicker ALD Al 2O 3 coatings resulted in the most stable nanoparticle structure, ALD Al 2O 3 coatings as thin as 0.2 nm resulted in thermally robust nanostructures as well. Additionally, the ALD Al 2O 3 coated nanoparticles were heated under propane to mimic reaction conditions. These experiments showed that while the nanoparticle geometries were not as stable under reducing atmosphere conditions, they were much more stable than uncoated nanoparticles and therefore have the potential to be used for SERS monitoring of reactions conducted at elevated temperatures.

Original languageEnglish
Pages (from-to)16827-16832
Number of pages6
JournalJournal of Physical Chemistry C
Volume111
Issue number45
DOIs
Publication statusPublished - Nov 15 2007

Fingerprint

Raman spectroscopy
Nanoparticles
nanoparticles
Substrates
coatings
Coatings
Propane
Geometry
Monitoring
Nanospheres
geometry
atomic structure
propane
Lithography
Nanostructures
Thermodynamic stability
thermal stability
Nitrogen
lithography
Experiments

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films
  • Energy(all)

Cite this

Toward a thermally robust operando surface-enhanced raman spectroscopy substrate. / Whitney, Alyson V.; Elam, Jeffrey W.; Stair, Peter C; Van Duyne, Richard P.

In: Journal of Physical Chemistry C, Vol. 111, No. 45, 15.11.2007, p. 16827-16832.

Research output: Contribution to journalArticle

Whitney, Alyson V. ; Elam, Jeffrey W. ; Stair, Peter C ; Van Duyne, Richard P. / Toward a thermally robust operando surface-enhanced raman spectroscopy substrate. In: Journal of Physical Chemistry C. 2007 ; Vol. 111, No. 45. pp. 16827-16832.
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