Tip‐Enhanced Near‐Field Optical Microscopy of Quasi‐1 D Nanostructures

Böhmler, Miriam; Hartschuh, Achim

doi:10.1002/cphc.201100670

Cited by 11 publications

(9 citation statements)

References 15 publications

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“…The power of TERS to improve the spatial resolution was demonstrated on single nanowires and crystallites [26][27][28] with a resolution comparable to that of AFM imaging. Raman and photoluminescence spectra of CdSe nanowires were investigated as well, achieving optical resolution below AFM resolution achieved in the same experiment due to square-law field dependence of both the excitation and the emission rates 29,30 . The improved spatial resolution of TERS also allowed mapping of stress and composition within a single quantum dot 31 .…”

Section: Introductionmentioning

confidence: 95%

Surface- and tip-enhanced resonant Raman scattering from CdSe nanocrystals

Sheremet

Milekhin

Rodriguez

et al. 2015

Phys. Chem. Chem. Phys.

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Surface- and tip-enhanced resonant Raman scattering (resonant SERS and TERS) by optical phonons in a monolayer of CdSe quantum dots (QDs) is demonstrated. The SERS enhancement was achieved by employing plasmonically active substrates consisting of gold arrays with varying nanocluster diameters prepared by electron-beam lithography. The magnitude of the SERS enhancement depends on the localized surface plasmon resonance (LSPR) energy, which is determined by the structural parameters. The LSPR positions as a function of nanocluster diameter were experimentally determined from spectroscopic micro-ellipsometry, and compared to numerical simulations showing good qualitative agreement. The monolayer of CdSe QDs was deposited by the Langmuir-Blodgett-based technique on the SERS substrates. By tuning the excitation energy close to the band gap of the CdSe QDs and to the LSPR energy, resonant SERS by longitudinal optical (LO) phonons of CdSe QDs was realized. A SERS enhancement factor of 2 × 10(3) was achieved. This allowed the detection of higher order LO modes of CdSe QDs, evidencing the high crystalline quality of QDs. The dependence of LO phonon mode intensity on the size of Au nanoclusters reveals a resonant character, suggesting that the electromagnetic mechanism of the SERS enhancement is dominant. Finally, the resonant TERS spectrum from CdSe QDs was obtained using electrochemically etched gold tips providing an enhancement on the order of 10(4). This is an important step towards the detection of the phonon spectrum from a single QD.

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Section: Introductionmentioning

confidence: 95%

Surface- and tip-enhanced resonant Raman scattering from CdSe nanocrystals

Sheremet

Milekhin

Rodriguez

et al. 2015

Phys. Chem. Chem. Phys.

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“…Tip‐enhanced Raman spectroscopy was soon recognized as a perfect tool to overcome this limitation, and has been extensively used since 2003 to investigate such one‐dimensional structures (not only carbon nanotubes but also, e.g., CdSe nanowires). The research groups of Novotny,40, 44, 98 Hartschuh,45, 99–103 Maultzsch,104–106 Williams,107 and Kawata11, 108 have made significant contributions in this area. Carbon nanotubes have also become a popular “test sample” for new technical developments in TERS, for example, in the study of Weber‐Bargioni et al 91.…”

Section: Applications Of Ters Imaging In Materials and Life Sciencesmentioning

confidence: 99%

Nanoscale Chemical Imaging Using Tip‐Enhanced Raman Spectroscopy: A Critical Review

et al. 2013

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Methods for chemical analysis at the nanometer scale are crucial for understanding and characterizing nanostructures of modern materials and biological systems. Tip-enhanced Raman spectroscopy (TERS) combines the chemical information provided by Raman spectroscopy with the signal enhancement known from surface-enhanced Raman scattering (SERS) and the high spatial resolution of atomic force microscopy (AFM) or scanning tunneling microscopy (STM). A metallic or metallized tip is illuminated by a focused laser beam and the resulting strongly enhanced electromagnetic field at the tip apex acts as a highly confined light source for Raman spectroscopic measurements. This Review focuses on the prerequisites for the efficient coupling of light to the tip as well as the shortcomings and pitfalls that have to be considered for TERS imaging, a fascinating but still challenging way to look at the nanoworld. Finally, examples from recent publications have been selected to demonstrate the potential of this technique for chemical imaging with a spatial resolution of approximately 10 nm and sensitivity down to the single-molecule level for applications ranging from materials sciences to life sciences.

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“…Carbon nanotubes (CNTs) are the most widely-studied nanomaterials using TERS so far [12,46,[82][83][84][85][86][87][88][89][90][91][92][93][94][95][96][97][98][99][100]. 1-D structures like single wall CNTs (SWCNTs) are the preferred samples to demonstrate the high resolution capability of a TERS instrument.…”

Section: -D Materialsmentioning

confidence: 99%

Tip-enhanced Raman spectroscopy: principles and applications

et al. 2015

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This review provides a detailed overview of the state of the art in tip-enhanced Raman spectroscopy (TERS) and focuses on its applications at the horizon including those in materials science, chemical science and biological science. The capabilities and potential of TERS are demonstrated by summarising major achievements of TERS applications in disparate fields of scientific research. Finally, an outlook has been given on future development of the technique and the mechanisms of achieving high signal enhancement and spatial resolution.

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Tip‐Enhanced Near‐Field Optical Microscopy of Quasi‐1 D Nanostructures

Cited by 11 publications

References 15 publications

Surface- and tip-enhanced resonant Raman scattering from CdSe nanocrystals

Surface- and tip-enhanced resonant Raman scattering from CdSe nanocrystals

Nanoscale Chemical Imaging Using Tip‐Enhanced Raman Spectroscopy: A Critical Review

Tip-enhanced Raman spectroscopy: principles and applications

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