Measurement of thermophysical properties of hydrogenated amorphous carbon thin films using picosecond thermoreflectance technique

Hasan Adli Alwi, Y. Y. Kim, Rozidawati Awang, S. A. Rahman, S. Krishnaswamy

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The thermophysical properties of hydrogenated amorphous carbon (a-C:H) thin films, namely the thermal diffusivity α, thermal effusivity É, thermal conductivity κ and volumetric heat capacity Cf have been measured simultaneously using ultrafast optical pump-probe technique. The pump-probe method utilizes the film surface temperature decay following a heating pulse from a pump laser. From the temperature decay, the thermal diffusivity α and effusivity É were obtained by curve-fittings of two different physical models. The thermal conductivity κ and volumetric heat capacity Cf were then deduced from the measured α and É using the relations κ = α1/2É and C f = É/α1/2. The thermal conductivity and volumetric heat capacity obtained compare favorably with those reported in the literatures. The method is independent of substrate and Al capping layers. The curve-fittings are simpler because independent of parameters of the films and the Kapitza boundary thermal resistance at Al/a-C:H interface.

Original languageEnglish
Pages (from-to)199-203
Number of pages5
JournalInternational Journal of Heat and Mass Transfer
Volume63
DOIs
Publication statusPublished - 2013

Fingerprint

Carbon films
Amorphous carbon
thermophysical properties
Specific heat
Thermal conductivity
thermal conductivity
Thermodynamic properties
Thermal diffusivity
curve fitting
specific heat
Curve fitting
Pumps
thermal diffusivity
pumps
Thin films
carbon
thin films
pulse heating
decay
thermal resistance

Keywords

  • Amorphous hydrogenated carbon
  • Picosecond thermoreflectance technique
  • Thermal conductivity
  • Thermal diffusivity
  • Thermal effusivity
  • Volumetric heat capacity

ASJC Scopus subject areas

  • Mechanical Engineering
  • Condensed Matter Physics
  • Fluid Flow and Transfer Processes

Cite this

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title = "Measurement of thermophysical properties of hydrogenated amorphous carbon thin films using picosecond thermoreflectance technique",
abstract = "The thermophysical properties of hydrogenated amorphous carbon (a-C:H) thin films, namely the thermal diffusivity α, thermal effusivity {\'E}, thermal conductivity κ and volumetric heat capacity Cf have been measured simultaneously using ultrafast optical pump-probe technique. The pump-probe method utilizes the film surface temperature decay following a heating pulse from a pump laser. From the temperature decay, the thermal diffusivity α and effusivity {\'E} were obtained by curve-fittings of two different physical models. The thermal conductivity κ and volumetric heat capacity Cf were then deduced from the measured α and {\'E} using the relations κ = α1/2{\'E} and C f = {\'E}/α1/2. The thermal conductivity and volumetric heat capacity obtained compare favorably with those reported in the literatures. The method is independent of substrate and Al capping layers. The curve-fittings are simpler because independent of parameters of the films and the Kapitza boundary thermal resistance at Al/a-C:H interface.",
keywords = "Amorphous hydrogenated carbon, Picosecond thermoreflectance technique, Thermal conductivity, Thermal diffusivity, Thermal effusivity, Volumetric heat capacity",
author = "Alwi, {Hasan Adli} and Kim, {Y. Y.} and Rozidawati Awang and Rahman, {S. A.} and S. Krishnaswamy",
year = "2013",
doi = "10.1016/j.ijheatmasstransfer.2013.03.062",
language = "English",
volume = "63",
pages = "199--203",
journal = "International Journal of Heat and Mass Transfer",
issn = "0017-9310",
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TY - JOUR

T1 - Measurement of thermophysical properties of hydrogenated amorphous carbon thin films using picosecond thermoreflectance technique

AU - Alwi, Hasan Adli

AU - Kim, Y. Y.

AU - Awang, Rozidawati

AU - Rahman, S. A.

AU - Krishnaswamy, S.

PY - 2013

Y1 - 2013

N2 - The thermophysical properties of hydrogenated amorphous carbon (a-C:H) thin films, namely the thermal diffusivity α, thermal effusivity É, thermal conductivity κ and volumetric heat capacity Cf have been measured simultaneously using ultrafast optical pump-probe technique. The pump-probe method utilizes the film surface temperature decay following a heating pulse from a pump laser. From the temperature decay, the thermal diffusivity α and effusivity É were obtained by curve-fittings of two different physical models. The thermal conductivity κ and volumetric heat capacity Cf were then deduced from the measured α and É using the relations κ = α1/2É and C f = É/α1/2. The thermal conductivity and volumetric heat capacity obtained compare favorably with those reported in the literatures. The method is independent of substrate and Al capping layers. The curve-fittings are simpler because independent of parameters of the films and the Kapitza boundary thermal resistance at Al/a-C:H interface.

AB - The thermophysical properties of hydrogenated amorphous carbon (a-C:H) thin films, namely the thermal diffusivity α, thermal effusivity É, thermal conductivity κ and volumetric heat capacity Cf have been measured simultaneously using ultrafast optical pump-probe technique. The pump-probe method utilizes the film surface temperature decay following a heating pulse from a pump laser. From the temperature decay, the thermal diffusivity α and effusivity É were obtained by curve-fittings of two different physical models. The thermal conductivity κ and volumetric heat capacity Cf were then deduced from the measured α and É using the relations κ = α1/2É and C f = É/α1/2. The thermal conductivity and volumetric heat capacity obtained compare favorably with those reported in the literatures. The method is independent of substrate and Al capping layers. The curve-fittings are simpler because independent of parameters of the films and the Kapitza boundary thermal resistance at Al/a-C:H interface.

KW - Amorphous hydrogenated carbon

KW - Picosecond thermoreflectance technique

KW - Thermal conductivity

KW - Thermal diffusivity

KW - Thermal effusivity

KW - Volumetric heat capacity

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