Band shapes in the infrared spectra of thin organic films on metal nanoparticles

Heaps, David A.; Griffiths, Peter R.

doi:10.1016/j.vibspec.2006.04.005

Cited by 47 publications

(66 citation statements)

References 27 publications

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“…These nanoparticles, mainly silver or gold are deposited onto the surface forming metal island films which provide localised enhancement of IR absorption. It is important to note that unlike SERS, the effect of enhancement in SEIRAS is not limited to gold or silver but has also been shown for other metals [46,47]. It is thought that the main contributing factor to the SEIRAS effect is the polarization of the metal island films by the incident IR radiation.…”

Section: Surface Enhanced Infrared Absorption Spectroscopymentioning

confidence: 99%

Recent applications of ATR FTIR spectroscopy and imaging to proteins

Glassford¹,

Byrne²,

Kazarian³

2013

Biochimica et Biophysica Acta (BBA) - Proteins and Proteomics

299

169

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Attenuated Total Reflection (ATR) Fourier Transform Infrared (FTIR) spectroscopy is a label-free, non-destructive analytical technique that can be used extensively to study a wide variety of different molecules in a range of different conditions. The aim of this review is to discuss and highlight the recent advances in the applications of ATR FTIR spectroscopic imaging to proteins. It briefly covers the basic principles of ATR FTIR spectroscopy and ATR FTIR spectroscopic imaging as well as their advantages to the study of proteins compared to other techniques and other forms of FTIR spectroscopy. It will then go on to examine the advances that have been made within the field over the last several years, particularly the use of ATR FTIR spectroscopy for the understanding and development of protein interaction with surfaces. Additionally, the growing potential of Surface Enhanced Infrared spectroscopy (SEIRAS) within this area of applications will be discussed. The review includes the applications of ATR FTIR imaging to protein crystallization and for highthroughput studies, highlighting the future potential of the technology within the field of protein structural studies and beyond.

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Section: Surface Enhanced Infrared Absorption Spectroscopymentioning

confidence: 99%

Recent applications of ATR FTIR spectroscopy and imaging to proteins

Glassford¹,

Byrne²,

Kazarian³

2013

Biochimica et Biophysica Acta (BBA) - Proteins and Proteomics

299

169

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“…However, in our earlier study [14], if surface plasmon resonance absorption peak in the visible region is blue-shifted and sharpening, then SEIRA is more enhanced. Results showing that the maximum enhancement of SEIRA is observed in a percolation thin film have been obtained from many previous experiments [15,16,17,18,19]. In the Osawa model, absorption of a percolation thin film is equivalent to a state in which the surface plasmon absorption peak in the visible region has shifted to the infrared region.…”

Section: Introductionmentioning

confidence: 77%

“…[2]. This SEIRA effect is used with infrared spectroscopy by which an adsorbates are deposited on a metal thin film to improve sensitivity [3,4,5,6]. Using the SEIRA effect, the enhanced absorption intensity is known to increase by some orders of magnitude at the maximum [7].…”

Section: Introductionmentioning

confidence: 99%

Surface plasmonic contribution to SEIRA and asymmetrical band

Nakashima¹,

Kita²,

Suzuki³

2014

aap

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The Surface Enhanced InfraRed Absorption (SEIRA) band reaches its the maximum intensity and the band shape becomes asymmetric at the just percolated metal thin films. To explain for them, various models (e.g. the Fano model) have been proposed. However, no model can explain them completely. In this paper, we conducted a classical model calculations (Fresnel's formula and the Bruggemann effective medium theory) for SEIRA and asymmetric bands. The calculated SEIRA spectra were good agreement with the experimentally spectra. Therefore, the asymmetrical SEIRA band might not be attributable to Fano model. Moreover, we specifically addressed the relation between effective dielectric constants of a metal-insulator composite thin film and SEIRA band shape change. Although the sign of the real part switched from positive to negative and although the imaginary part became metallic, the asymmetrical band shape did not change. The sign of the real part is 28 Hiroshi Nakashima et. al.expected to be negative and the imaginary part would be metallic if the asymmetrical band shape change results from surface plasmon. Therefore, the asymmetrical band shape might not be attributable to surface plasmon.

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“…While weak absorption bands are nearly symmetrical, they tend to become asymmetrical, and the shapes seem to be a mixture of the typical symmetric form of the bands in the imaginary part of the refractive index spectrum (for low oscillator strengths) and the asymmetrical band shapes of the real part of the refractive index function ("dispersion like"). Finally, they can completely take on this "dispersion-like" form [17], which is also called and described as "Fano-like" [23].…”

Section: On-resonance Enhancementmentioning

confidence: 99%

“…With increasing signal, unfortunately, the band shapes in the spectra of the analytes begin to change. While they resemble that of the bands of the imaginary part of the complex refractive index at lower enhancement, they generally become more distorted around the percolation threshold and finally resemble the real part of the refractive index [16,17].…”

Section: Introductionmentioning

confidence: 96%

Periodic array-based substrates for surface-enhanced infrared spectroscopy

Mayerhöfer

Popp

2017

Nanophotonics

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At the beginning of the 1980s, the first reports of surface-enhanced infrared spectroscopy (SEIRS) surfaced. Probably due to signal-enhancement factors of only 10 1 to 10 3 , which are modest compared to those of surface-enhanced Raman spectroscopy (SERS), SEIRS did not reach the same significance up to date. However, taking the compared to Raman scattering much larger crosssections of infrared absorptions and the enhancement factors together, SEIRS reaches about the same sensitivity for molecular species on a surface in terms of the crosssections as SERS and, due to the complementary nature of both techniques, can valuably augment information gained by SERS. For the first 20 years since its discovery, SEIRS relied completely on metal island films, fabricated by either vapor or electrochemical deposition. The resulting films showed a strong variance concerning their structure, which was essentially random. Therefore, the increase in the corresponding signal-enhancement factors of these structures stagnated in the last years. In the very same years, however, the development of periodic array-based substrates helped SEIRS to gather momentum. This development was supported by technological progress concerning electromagnetic field solvers, which help to understand plasmonic properties and allow targeted design. In addition, the strong progress concerning modern fabrication methods allowed to implement these designs into practice. The aim of this contribution is to critically review the development of these engineered surfaces for SEIRS, to compare the different approaches with regard to their performance where possible, and report further gain of knowledge around and in relation to these structures.

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Band shapes in the infrared spectra of thin organic films on metal nanoparticles

Cited by 47 publications

References 27 publications

Recent applications of ATR FTIR spectroscopy and imaging to proteins

Recent applications of ATR FTIR spectroscopy and imaging to proteins

Surface plasmonic contribution to SEIRA and asymmetrical band

Periodic array-based substrates for surface-enhanced infrared spectroscopy

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