期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 121, 期 27, 页码 14737-14744出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.7b04787
关键词
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资金
- Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource (National Science Foundation (NSF)) [ECCS-1542205]
- MRSEC program (NSF) at the Materials Research Center [DMR-1121262]
- International Institute for Nanotechnology (IIN)
- Keck Foundation
- State of Illinois, through the IIN
- NSF CaSTL Center (NSF) [CHE-1414466]
- AFOSR MURI Grant [FA9550-14-1-0003]
- Department of Physics and Astronomy
- College of Science of The University of Texas at San Antonio
- Office of the Provost, the Office for Research, and Northwestern University Information Technology (NUIT)
- Air Force Research Laboratory [FA8650-15-2-5518]
- Assistant Secretary of Defense for Health Affairs, through the Peer Reviewed Medical Research Program [W81XWH-16-1-0375]
- Direct For Mathematical & Physical Scien [1414466] Funding Source: National Science Foundation
- Division Of Chemistry [1414466] Funding Source: National Science Foundation
Lithographic and nonlithographic two-dimensional (2D) substrates for surface-enhanced Raman spectroscopy (SERS) have gained enormous popularity as analytical platforms for detection and identification of various analytes. However, their near- and far-field properties in most cases remain poorly understood. We have previously developed a metal nanopillar film over nanospheres (FON) platform exhibiting Raman enhancement factors of similar to 10(7). These substrates have a reproducible and predictable localized surface plasmon resonance throughout the entire visible region and much of the near-IR region of the electromagnetic spectrum. Extending upon these results, we have utilized wavelength-scan surface-enhanced Raman excitation spectroscopy to unravel the relationship between near- and far-field properties of FON surface-enhanced Raman spectroscopy substrates. We examined by scanning electron microscopy FONs fabricated by either stationary (ST-FONs) or spun (SP-FONs) metal deposition to examine the interrelationships of nanoscale structure and near- and far-fled properties. We demonstrate that the line width and spectral position of the far-field and near-field resonances of ST- and SP-FONs directly depend on the nanofeature distribution at the metallic surface. In particular, we show that the actual nanofeature morphology and distribution directly impact the spectral alignment of the far-field and near-field resonances.
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