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Title: Error and uncertainty in Raman thermal conductivity measurements

Journal Article · · Review of Scientific Instruments
DOI:https://doi.org/10.1063/1.4918623· OSTI ID:1185029
 [1];  [2]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Georgia Inst. of Technology, Atlanta, GA (United States)
  2. Georgia Inst. of Technology, Atlanta, GA (United States)

We investigated error and uncertainty in Raman thermal conductivity measurements via finite element based numerical simulation of two geometries often employed -- Joule-heating of a wire and laser-heating of a suspended wafer. Using this methodology, the accuracy and precision of the Raman-derived thermal conductivity are shown to depend on (1) assumptions within the analytical model used in the deduction of thermal conductivity, (2) uncertainty in the quantification of heat flux and temperature, and (3) the evolution of thermomechanical stress during testing. Apart from the influence of stress, errors of 5% coupled with uncertainties of ±15% are achievable for most materials under conditions typical of Raman thermometry experiments. Error can increase to >20%, however, for materials having highly temperature dependent thermal conductivities or, in some materials, when thermomechanical stress develops concurrent with the heating. A dimensionless parameter -- termed the Raman stress factor -- is derived to identify when stress effects will induce large levels of error. Together, the results compare the utility of Raman based conductivity measurements relative to more established techniques while at the same time identifying situations where its use is most efficacious.

Research Organization:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC04-94AL85000
OSTI ID:
1185029
Alternate ID(s):
OSTI ID: 1228149
Report Number(s):
SAND-2014-20695J; 553932
Journal Information:
Review of Scientific Instruments, Vol. 86, Issue 4; ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 34 works
Citation information provided by
Web of Science

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Cited By (5)

An electrical thermometry platform for measuring cross-plane thermal conductivity of 2D flakes on substrate journal September 2019
Nonmonotonic thickness-dependence of in-plane thermal conductivity of few-layered MoS 2 : 2.4 to 37.8 nm journal January 2018
Determination of thermal conductivity using micro‐Raman spectroscopy with a three‐dimensional heating model journal August 2019
Thermal conductivity of MoS 2 monolayers from molecular dynamics simulations journal March 2019
Temperature-dependent thermal conductivity of a single Germanium nanowire measured by Optothermal Raman Spectroscopy preprint January 2020