Surface-enhanced Raman scattering of ortho- and para-mercaptophenols in silver sol

Lee, Hwa-Mi; Kim, Myoung Soo; Kim, Kwan

doi:10.1016/0924-2031(94)85007-0

Cited by 36 publications

(15 citation statements)

References 20 publications

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“…Optical images of as‐grown CNTs film and its densified film are seen in Figure S1 and their densities are shown in Figure S2. In Figure 2c, the SERS spectra were observed for 4‐MPH adsorbed on gold nanoparticles along the CNT walls and the peak positions are in good agreement with the previous studies 28–30. The intensity of the overall SERS signal decreases with depth from the near the top surface as does the density of gold nanoparticles corresponding to the decline of the population of hot spots, in which the characteristic peak at 1076 cm −1 representing the ring breathing mode of 4‐MPH is diminishing from the near top surface to the bottom.…”

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confidence: 87%

Utilizing 3D SERS Active Volumes in Aligned Carbon Nanotube Scaffold Substrates

et al. 2012

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Gold and silver nanoparticles and nanostructures exhibit plasmon resonances that result in strong scattering and absorption of light, as well as enhanced optical fi elds near the metal surface. The resonant fi eld enhancement dramatically enhances the weak Raman scattering signals from molecules near the metal surface. [ 1 ] This effect, called surface enhanced Raman scattering (SERS), has been widely pursued as a molecular sensing technology over the past decade. [ 2 , 3 ] SERS is non-destructive, suffi ciently sensitive for single molecule detection, and provides inherent molecular specifi city since it yields molecular vibrational spectra. While fi eld enhancement occurs over an entire nanostructure surface, SERS signals are strongest from small gaps between nanoparticles referred to as "hot spots" where the fi eld enhancement is maximal. [ 4 , 5 ] Most SERS work to date has focused on detection with substrates that are designed to maximize the density, sensitivity, and reproducibility of hot spots in order to give the strongest possible SERS signal. Many substrates have been developed which refl ect the variety of nanofabrication, synthesis, and assembly strategies that have emerged over the past decade. These include semiconducting nanowires, [ 6 ] aggregated colloids, [ 7 , 8 ] colloidal lithography, [ 9 , 10 ] soft lithography, [ 11 , 12 ] e-beam lithography, [ 13 ] and colloidal assembly. [ 14 , 15 ] Most of the substrates consist of nanostructured gold or silver on a fl at substrate. Some reports describe substrates with increased surface roughness to increase the number of hot spots, including aligned carbon nanotube substrates that support silver nanoparticles. [ 16 ] These substrates were found to provide highly sensitive detection. However, optical scattering and light collection occur in a three dimensional focal volume. Therefore, to maximize the quantity of scattered light generated and detected, SERS substrates should contain hot spots in a large three dimensional volume that is matched to the optics of the SERS instrumentation. Three dimensional substrates have been fabricated and tested based on porous silicon, microfabricated silicon, and porous gold. [17][18][19][20] These have indeed improved the detection limit for small molecules like trinitrotoluene (TNT). Therefore, it is desirable to create densely packed metal nanostructures with nanogaps to form plentiful hot spots for better SERS performance. [21][22][23] In the present study, we describe the fabrication of a structurally tunable 3D SERS substrate based on vertically aligned CNTs. Vertically aligned CNTs provide a new paradigm to realize three dimensional SERS substrates with high nanoparticle density. The vertically aligned CNTs were synthesized on a SiO 2 substrate by water-assisted chemical vapor deposition (CVD). The resulting vertically aligned CNTs were several millimeters long and were composed of a mixture of double-and triple-walled nanotubes. [ 24 , 25 ] A gold fi lm (50 nm thickness) was deposited on top of the CN...

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confidence: 87%

Utilizing 3D SERS Active Volumes in Aligned Carbon Nanotube Scaffold Substrates

et al. 2012

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“…2b can be attributed to the C-O stretching vibration of 4-MPH, while the bands at 1367 and 1095 cm −1 are due to the inplane O-H bending and the ring vibration possessing the C-S stretching characteristics, respectively [31,32]. Other bands can be assigned to proper ring modes [33]. Fig.…”

Section: Resultsmentioning

confidence: 98%

Stabilization of hydroxyl-group-terminated SERS-marker molecules on μAg particles by silanization

Xia

Kim

2007

Journal of Colloid and Interface Science

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“…The newly emergent bands of 882 cm −1 and 1589 cm −1 are attributed to benzene ring stretching (ʋ 12 ) and the totally symmetric ring stretching (ʋ 8a ) of 3-HTP. 34 …”

Section: Resultsmentioning

confidence: 99%

Sensing Glucose in Urine and Serum and Hydrogen Peroxide in Living Cells by Use of a Novel Boronate Nanoprobe Based on Surface-Enhanced Raman Spectroscopy

et al. 2016

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Hydrogen peroxide (H2O2) is known as a key molecule in a variety of biological processes, as well as a crucial byproduct in many enzymatic reactions. Therefore, being able to selectively and sensitively detect H2O2 is not only important in monitoring, estimating and decoding H2O2 relevant physiological pathways, but also very helpful in developing enzymatic-based biosensors towards other analytes of interest. Herein, we report a plasmonic probe for H2O2 based on 3-mercaptophenylboronic acid (3-MPBA) modified gold nanoparticles (AuNPs) which is coupled with surface-enhanced Raman scattering (SERS) to yield a limit of detection (LOD) of 70 nM. Our probe quantifies both exogenous and endogenous H2O2 levels in living cells and can further be coupled with glucose oxidase (GOx) to achieve quantitative and selective detection of glucose in artificial urine and human serum.

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Surface-enhanced Raman scattering of ortho- and para-mercaptophenols in silver sol

Cited by 36 publications

References 20 publications

Utilizing 3D SERS Active Volumes in Aligned Carbon Nanotube Scaffold Substrates

Utilizing 3D SERS Active Volumes in Aligned Carbon Nanotube Scaffold Substrates

Stabilization of hydroxyl-group-terminated SERS-marker molecules on μAg particles by silanization

Sensing Glucose in Urine and Serum and Hydrogen Peroxide in Living Cells by Use of a Novel Boronate Nanoprobe Based on Surface-Enhanced Raman Spectroscopy

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