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All Journal JFA (Jurnal Fisika dan Aplikasinya)
Wipsar Sunu Brams Dwandaru Wipsar Sunu Brams Dwandaru
Physics Education Department, Faculty of Mathematics and Natural Sciences, Universitas Negeri Yogyakarta, Yogyakarta 55281, Indonesia
Physics

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Simple Investigation on the Optical Properties of Carbon Nanodots Using Lasers and a Lux Meter: Febriani Febriani, Athi' Nur Auliati Rahmah, Bian Itsna Ashfa Al Ashfiya, Juli Astono, Wipsar Sunu Brams Dwandaru Febriani Febriani Febriani Febriani; Athi’ Nur Auliati Rahmah Athi’ Nur Auliati Rahmah; Bian Itsna Ashfa Al Ashfiya Bian Itsna Ashfa Al Ashfiya; Juli Astono Juli Astono; Wipsar Sunu Brams Dwandaru Wipsar Sunu Brams Dwandaru
Jurnal Fisika dan Aplikasinya Vol 18 No 1 (2022): January 2022 Edition
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v18i1.11005

Abstract

Carbon nanodots (Cdots) have excellent optical properties. This study aims to investigate scattering and absorption of Cdots via simple exposure of ultraviolet (UV)/violet, red, and green lasers. The experiment was conducted by preparing the Cdots from cajuput oil distillation wastes as the precursor. The solid wastes were dried under the sun, grounded into powder, filtered, and carbonized inside an oven at 250 oC for one hour. The carbonized powder was then mixed with distilled water, left for a night, and then filtered again so that the Cdots solution was obtained. Here, the mass of the precursor was varied. The Cdots samples were characterized using ultraviolet-visible (UV-Vis) and photoluminescence (PL) spectroscopies, and also particle size analyzer (PSA). The lasers were directly exposed to the Cdots samples. A digital lux-meter was used to measure the intensity of the lasers transmitted from the sample. The angle of the lux-meter was varied on a circular track. The sample was on the center of the track. The UV-Vis characterization showed two peaks at 217 nm and 270 nm, and a tail extending to the visible region. The PL characterization showed an intensity peak at 509.57 nm, which confirms the cyan luminescence of the Cdots. The PSA characterization indicated that the size of the Cdots was 1.04 nm. Moreover, at an angle of 0o, the UV wavelength was strongly absorbed by the Cdots in accordance with the UV-Vis characterization result. The intensity of the green laser also dominates as it was less absorbed and strongly scattered by the Cdots.
Audio Bio Harmonic with WT5001 Smartchipusing Solar Cell: Nur Kadarisman, Fitria Ayu Sulistiani, Wipsar Sunu Brams Dwandaru, Rhyko Irawan Wisnuwijaya, Agus Sugiarto Nur Kadarisman Nur Kadarisman; Fitria Ayu Sulistiani Fitria Ayu Sulistiani; Wipsar Sunu Brams Dwandaru Wipsar Sunu Brams Dwandaru; Rhyko Irawan Wisnuwijaya Rhyko Irawan Wisnuwijaya; Agus Sugiarto Agus Sugiarto
Jurnal Fisika dan Aplikasinya Vol 16 No 2 (2020): June 2020 Edition
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v16i2.3750

Abstract

The design of audio bio harmonic (ABH) with smartchip WT5001 using solar cell technology in the form of ABH instrumentation with an electricity resource derived from solar energy has been successfully created and tested, which includes (i) testing the peak frequency of sound and sound output, and (ii) emptying and charging tests to determine the effectiveness of the use of the solar cell as the power provider. The ABH system consists of (i) a sound generator device composed of WT5001 sound modules, amplifiers, and horn speakers, and (ii) structured power supply devices for solar cell modules, charger controllers, and batteries for storing power. The test results of the peak frequency for the insect (garengpung) sound files and the output sound of the ABH device indicate a deviation of peak frequency of 13.46 Hz to140.81 Hz. The 15 hours emptying test results in on mode with battery charging for 7 hours shows that the use of 10Wp solar cell is effective to provide electrical power in ABH tool operation.
Co-Authors Agus Sugiarto Agus Sugiarto Athi’ Nur Auliati Rahmah Athi’ Nur Auliati Rahmah Bian Itsna Ashfa Al Ashfiya Bian Itsna Ashfa Al Ashfiya Febriani Febriani Febriani Febriani Fitria Ayu Sulistiani Fitria Ayu Sulistiani Juli Astono Juli Astono Nur Kadarisman Nur Kadarisman Rhyko Irawan Wisnuwijaya Rhyko Irawan Wisnuwijaya