Do it yourself: Optical spectrometer for physics undergraduate instruction in nanomaterial characterization

Nuryantini, Ade Yeti and Mahen, Ea Cahya Septia and Sawitri, Asti and Nuryadin, Bebeh Wahid (2017) Do it yourself: Optical spectrometer for physics undergraduate instruction in nanomaterial characterization. European Journal of Physics, 38 (5). pp. 1-11. ISSN P-ISSN: 0143-0807, E-ISSN ; 1361-6404

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Abstract

In this paper, we report on a homemade optical spectrometer using diffraction grating and image processing techniques. This device was designed to produce spectral images that could then be processed by measuring signal strength (pixel intensity) to obtain the light source, transmittance, and absorbance spectra of the liquid sample. The homemade optical spectrometer consisted of: (i) a white LED as a light source, (ii) a cuvette or sample holder, (iii) a slit, (iv) a diffraction grating, and (v) a CMOS camera (webcam). In this study, various concentrations of a carbon nanoparticle (CNP) colloid were used in the particle size sample test. Additionally, a commercial optical spectrometer and tunneling electron microscope (TEM) were used to characterize the optical properties and morphology of the CNPs, respectively. The data obtained using the homemade optical spectrometer, commercial optical spectrometer, and TEM showed similar results and trends. Lastly, the calculation and measurement of CNP size were performed using the effective mass approximation (EMA) and TEM. These data showed that the average nanoparticle sizes were approximately 2.4 nm and 2.5 ± 0.3 nm, respectively. This research provides new insights into the development of a portable, simple, and low-cost optical spectrometer that can be used in nanomaterial characterization for physics undergraduate instruction.

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