Conference proceeding
Surface enhanced Raman scattering and microwave absorption in silver nanoparticle inks
PLASMONICS IN BIOLOGY AND MEDICINE IX, v 8234(1), pp 82340A-82340A-6
01 Jan 2012
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Metallic nanoparticle inks - colloidal suspensions of silver or gold nanoparticles in water or other organic solvents - can be sintered at relatively low temperatures (70 - 200 degrees C). With appropriate thermal treatment the sintering can be controlled to fabricate nanoparticle substrates with a distribution of clusters sizes and interparticle distances. Such substrates exhibit relatively high (10(8) - 10(9)) surface enhanced Raman scattering (SERS) amplification factors (AFs). The high AFs in such substrates arise from several mechanisms. The 'dimers' - two nanoparticles separated by a nanometer-size gap - are known to produce amplification of the local electric field orders of magnitude larger than at the surface of an isolated single nanoparticle due to surface plasmon resonance. Furthermore, the lack of translational symmetry in the clusters leads to localizations of electromagnetic excitations to very small regions that can create SERS hot spots. Here we report that microwave absorption (similar to 10 GHz) as a function of thermal annealing in dry-drop substrates can be used to monitor the sintering process in metallic nanoparticle inks. The predominant contribution to microwave absorption comes from electrically resistive weak links that are formed between nanoparticles as a result of the thermal treatment. Just before the creation of these weak links, such nanoparticle pairs are also the ones that make a major contribution to the SERS AFs. This leads to a correlation between the observed microwave absorption and the SERS signal intensities. We also present a simple model that describes the microwave absorption as a function of the isothermal annealing treatment.
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Details
- Title
- Surface enhanced Raman scattering and microwave absorption in silver nanoparticle inks
- Creators
- Manuel Figueroa - Drexel UniversityStephen Schraer - Villanova UniversityKambiz Pourrezaei - Drexel UniversitySomdev Tyagi - Drexel University
- Contributors
- T VoDinh (Editor)Lakowicz (Editor)
- Publication Details
- PLASMONICS IN BIOLOGY AND MEDICINE IX, v 8234(1), pp 82340A-82340A-6
- Series
- Proceedings of SPIE
- Publisher
- Spie-Int Soc Optical Engineering
- Number of pages
- 6
- Grant note
- Nano-Technology Initiative (NIT) of Southeastern Pennsylvania EEC-1005090 / National Science Foundations iREU: Interdisciplinary Research Experience for Undergraduates in Medicine, Energy and Advanced Materials; National Science Foundation (NSF)
- Resource Type
- Conference proceeding
- Language
- English
- Academic Unit
- Physics; School of Biomedical Engineering, Science, and Health Systems
- Web of Science ID
- WOS:000306169900006
- Scopus ID
- 2-s2.0-84857583029
- Other Identifier
- 991019168117204721
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InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Chemistry, Physical
- Materials Science, Multidisciplinary
- Optics