Hoda Malekpour

Hoda Malekpour
University of California, Riverside | UCR · Department of Electrical Engineering

PhD

About

10
Publications
5,144
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911
Citations

Publications

Publications (10)
Chapter
Full-text available
Development of the next generation of micro- and nanoscale electronics requires efficient thermal management. As the dissipated power density increases, heat removal becomes a critical issue. This motivates researchers to investigate and synthesize materials that can drastically improve thermal management of electronic devices. The discovery of the...
Article
Full-text available
We describe Raman spectroscopy-based method of measuring thermal conductivity of thin films and review significant results achieved with this technique pertinent to graphene and other two-dimensional materials. The optothermal Raman method was instrumental for the discovery of unique heat conduction properties of graphene. In this method, Raman spe...
Article
Full-text available
We have performed a rigorous investigation of the structure and composition of individual grains in copper-zinc-tin-sulfide (CZTS) films realized by sulfurization of a sputtered metal stack. Although on average close to the ideal CZTS stoichiometry, elemental analysis shows significant grain-to-grain variations in composition. High resolution Raman...
Article
We investigate the thermal conductivity of suspended graphene as a function of the density of defects, ND, introduced in a controllable way. High-quality graphene layers are synthesized using chemical vapor deposition, transferred onto a transmission electron microscopy grid, and suspended over ∼7.5 μm size square holes. Defects are induced by irra...
Article
Full-text available
We investigate the thermal conductivity of suspended graphene as a function of the density of defects, ND, introduced in a controllable way. Graphene layers are synthesized using chemical vapor deposition, transferred onto a transmission electron microscopy grid, and suspended over ~7.5-micrometer size square holes. Defects are induced by irradiati...
Article
Full-text available
We report results of a combined investigation of thermal conductivity and acoustic phonon spectra in nanoporous alumina membranes with the pore diameter decreasing from D=180 nm to 25 nm. The samples with the hexagonally arranged pores were selected to have the same porosity of ~13%. The Brillouin-Mandelstam spectroscopy measurements revealed bulk-...
Conference Paper
Full-text available
We used the Brillouin-Mandelstam light scattering spectroscopy to demonstrate modification of the phonon dispersion in 2D alumina superlattices with nanometer sizes. Non-linearity of phonon dispersion in the phononic superlattices creates new possibilities for controlling the optical and thermal properties of such structures.
Article
Full-text available
We investigated thermal conductivity of free-standing reduced graphene oxide films subjected to a high-temperature treatment of up to 1000 C. It was found that the high-temperature annealing dramatically increased the in-plane thermal conductivity, K, of the films from 3 W/mK to 61 W/mK at room temperature. The cross-plane thermal conductivity, Kc,...
Article
Full-text available
We have investigated thermal conductivity of graphene laminate films deposited on polyethylene terephthalate substrates. Two types of graphene laminate were studied - as deposited and compressed - in order to determine the physical parameters affecting the heat conduction the most. The measurements were performed using the optothermal Raman techniq...
Article
Full-text available
We have investigated thermal conductivity of graphene laminate films deposited on polyethylene terephthalate substrates. Two types of graphene laminate were studied - as deposited and compressed - in order to determine the physical parameters affecting the heat conduction the most. The measurements were performed using the optothermal Raman techniq...

Questions

Question (1)
Question
I am trying to measure the density of graphene laminate on plastic substrate. I have several samples with different densities and thicknesses. I need to precisely measure the density of graphene laminate. The thickness of the laminate is on the order of 10 microns (I don't know the exact thickness since it varies at different places). what I've tried is to cut the sample and weigh it, then measure the dimensions and calculate the density. But it seems that it's not a precise method and I got odd results.
Can any one help me through this?

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