AlisonConstantin: Difference between revisions
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==Introduction== | ==Introduction== | ||
Material characterization is an essential part of the development of any device, from the nanoscale to macroscale and from prototyping to mass-production. Here techniques that allow to investigate the material composition and to trouble-shoot problems caused by effects such as strain. In our case, we recently found two transparent chips (Fig. \ref{chips_photo_fig}). Our lab works with two different materials that can both be clear: diamond and 4H-SiC. Thus, we set out to identify which material comprised each chip. | |||
Many different methods can be used to distinguish diamond from 4H-SiC, from hardness testing to X-ray diffraction. We opted to perform Raman spectroscopy as it is a non-invasive, low-energy characterization technique. As we discuss in further detail below, diamond and 4H-SiC both have large enough Raman shifts that we expect to be able to discern the Raman scattering spectral lines from the excitation laser with the appropriate spectral filters and a commercial spectrometer. | |||
==Background== | ==Background== | ||
[[File:Screen_Shot_2016-11-29_at_7.05.37_PM.png|200px]] | [[File:Screen_Shot_2016-11-29_at_7.05.37_PM.png|200px]] | ||
Revision as of 17:36, 6 December 2019
Abstract
In this project, we apply the theoretical learnings from class in laboratory experiments. Our goal was to identify the material of two chips that looked identical to our eyes. Using a 532~nm laser, a grating spectrometer, and a CCD, we were able to identify the materials through Raman spectroscopy. Lastly, we thought of a way how we could do the same experiment at significantly smaller financial cost.
Introduction
Material characterization is an essential part of the development of any device, from the nanoscale to macroscale and from prototyping to mass-production. Here techniques that allow to investigate the material composition and to trouble-shoot problems caused by effects such as strain. In our case, we recently found two transparent chips (Fig. \ref{chips_photo_fig}). Our lab works with two different materials that can both be clear: diamond and 4H-SiC. Thus, we set out to identify which material comprised each chip.
Many different methods can be used to distinguish diamond from 4H-SiC, from hardness testing to X-ray diffraction. We opted to perform Raman spectroscopy as it is a non-invasive, low-energy characterization technique. As we discuss in further detail below, diamond and 4H-SiC both have large enough Raman shifts that we expect to be able to discern the Raman scattering spectral lines from the excitation laser with the appropriate spectral filters and a commercial spectrometer.
Background
Methods