Search | Engineering

Subscribe Submit

Home Journals Focus Achievement Fronts About Us 中文版

Resource Type

Journal Article 3

Year

2018 3

Keywords

2D material 1

amorphous material 1

atomic force microscopy 1

diffusive scattering 1

energy materials 1

mean free path 1

molecular resonances 1

nanoporous film 1

phonon 1

phonon behavior 1

photo-induced force microscopy 1

photo-thermal induced resonance 1

scanning near-field optical microscopy 1

structural thermal domain (STD) size 1

structure defects 1

surface phonon polaritons 1

thermal reffusivity theory 1

thermoelectrics 1

tip-enhanced Raman spectroscopy 1

vibrational spectroscopy 1

open ︾

Search scope:

排序： Display mode:

Thermal reffusivity: uncovering phonon behavior, structural defects, and domain size

Yangsu XIE, Bowen ZHU, Jing LIU, Zaoli XU, Xinwei WANG

Frontiers in Energy 2018, Volume 12, Issue 1, Pages 143-157 doi: 10.1007/s11708-018-0520-z

Abstract: analyzing structural domain size and defect levels of metals, the thermal reffusivity can also uncover phonon

Keywords： thermal reffusivity theory phonon behavior structure defects structural thermal domain (STD) size 2D

HTML PDF Collect

Largely reduced cross-plane thermal conductivity of nanoporous In

Dongchao XU, Quan WANG, Xuewang WU, Jie ZHU, Hongbo ZHAO, Bo XIAO, Xiaojia WANG, Xiaoliang WANG, Qing HAO

Frontiers in Energy 2018, Volume 12, Issue 1, Pages 127-136 doi: 10.1007/s11708-018-0519-5

Abstract: This removes the uncertainty in the phonon transport analysis due to amorphous pore edges.Based on the measurement results, remarkable phonon size effects can be found for a thin film with periodic

Keywords： nanoporous film thermoelectrics phonon mean free path diffusive scattering

HTML PDF Collect

Review: Tip-based vibrational spectroscopy for nanoscale analysis of emerging energy materials

Amun JARZEMBSKI, Cedric SHASKEY, Keunhan PARK

Frontiers in Energy 2018, Volume 12, Issue 1, Pages 43-71 doi: 10.1007/s11708-018-0524-8

Abstract: Vibrational spectroscopy is one of the key instrumentations that provide non-invasive investigation of structural and chemical composition for both organic and inorganic materials. However, diffraction of light fundamentally limits the spatial resolution of far-field vibrational spectroscopy to roughly half the wavelength. In this article, we thoroughly review the integration of atomic force microscopy (AFM) with vibrational spectroscopy to enable the nanoscale characterization of emerging energy materials, which has not been possible with far-field optical techniques. The discussed methods utilize the AFM tip as a nanoscopic tool to extract spatially resolved electronic or molecular vibrational resonance spectra of a sample illuminated by a visible or infrared (IR) light source. The absorption of light by electrons or individual functional groups within molecules leads to changes in the sample’s thermal response, optical scattering, and atomic force interactions, all of which can be readily probed by an AFM tip. For example, photothermal induced resonance (PTIR) spectroscopy methods measure a sample’s local thermal expansion or temperature rise. Therefore, they use the AFM tip as a thermal detector to directly relate absorbed IR light to the thermal response of a sample. Optical scattering methods based on scanning near-field optical microscopy (SNOM) correlate the spectrum of scattered near-field light with molecular vibrational modes. More recently, photo-induced force microscopy (PiFM) has been developed to measure the change of the optical force gradient due to the light absorption by molecular vibrational resonances using AFM’s superb sensitivity in detecting tip-sample force interactions. Such recent efforts successfully breech the diffraction limit of light to provide nanoscale spatial resolution of vibrational spectroscopy, which will become a critical technique for characterizing novel energy materials.

Keywords： microscopy tip-enhanced Raman spectroscopy photo-induced force microscopy molecular resonances surface phonon