Article Per Year (5 Year)
p-Index From 2020 - 2025
0.444
P-Index
This Author published in this journals
All Journal JURNAL KIMIA SAINS DAN APLIKASI Peka: Jurnal Pengabdian Kepada Masyarakat
Jonathan, Nicholas
Unknown Affiliation
Religion Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Economics, Econometrics & Finance Education Electrical & Electronics Engineering Engineering Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Mechanical Engineering Medicine & Pharmacology Nursing Physics Public Health Social Sciences

Published : 2 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 2 Documents
Search

 1 
UKWMS’ COMMUNITY ENGAGEMENT FOR DEVELOPMENT: PROMOTING ECONOMIC GROWTH THROUGH PRODUCT DEVELOPMENT AND DIGITAL MARKETING AT PUHSARANG KEDIRI Yuniarto, Antonius; Mawasti, Alpi; Memarista, Gesti; Agung, Deatri Arumsari; Setyawan, Annisa Alfa; Kristanto, Visi Saujaningati; Jonathan, Nicholas
PeKA: Jurnal Pengabdian Kepada Masyarakat Vol 6, No 2 (2023): Desember
Publisher : Fakultas Bisnis, Universitas Katolik Widya Mandala Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33508/peka.v6i2.5245

Abstract

In the era of globalization, the level of competition for Small and Medium Enterprises is getting tighter, exacerbated by the severe situation of the Covid-19 pandemic, making it difficult for MSMEs to market the products they produce. CED UKWMS 2023 is a form of community activity held in Puhsarang Kediri aimed at increasing the capabilities of MSME partners to grow and develop. The CED will be conducted on July 20-28, 2023, involving 27 participants from 3 countries: the Philippines, Malaysia, and Indonesia. The series of activities carried out at CED in the form of service learning projects focus on product development activities and online markets. The output produced from is in the form of packaging prototype designs, logo designs, stickers, banners. In addition, the output of digital marketing development is in the form of creating social media accounts such as Instagram as a marketing medium for MSME products. In general, CED this time has provided solutions to the problems of MSME partners related to product development and online/digital markets.
Synthesis and Characterization of rGO Using a Combination Hummers Method and Hydrothermal Reduction Pardede, Maichel Letare; Jonathan, Nicholas; Irawan, Robin; Nugroho, Agung; Susanti, Ratna Frida
Jurnal Kimia Sains dan Aplikasi Vol 28, No 7 (2025): Volume 28 Issue 7 Year 2025
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jksa.28.7.396-404

Abstract

Reduced graphene oxide (rGO) was successfully synthesized through a combination of two oxidation methods. The Hummers method was employed to synthesize graphite oxide (GrO), followed by a hydrothermal reduction technique to obtain a more ordered rGO structure. X-ray diffraction (XRD) analysis confirmed the transformation of GrO to rGO, as indicated by an interlayer spacing of 0.35–0.40 nm. This value reflects the crystalline characteristics and multilayer nature of the structure. The calculated crystallite size yielded La = 5.825 nm and Lc = 0.967 nm, suggesting a relatively high degree of crystallinity. Raman spectroscopy revealed an increase in structural disorder after the reduction process, as shown by an ID1/IG ratio of 1.771, which indicates the formation of structural defects due to the removal of oxygen-containing groups. Meanwhile, the IG/ID3 ratio of 1.039 confirms that the carbon atoms in rGO are arranged in a hexagonal graphite lattice. Additionally, the I2D/IG ratio of 0.321 indicates the presence of a multilayer structure. Scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy (SEM-EDX) showed that the rGO consists of graphene layers exhibiting folding and wrinkling, likely caused by thermal fluctuations during reduction at 180°C. The success of the reduction process was further supported by the increase in the C/O ratio from 2.42 in GrO to 5.39 in rGO. Electrochemical characterization by cyclic voltammetry (CV) demonstrated that rGO exhibits pseudocapacitive behavior, achieving a specific capacitance of 408.661 F/g at a scan rate of 5 mV/s. Overall, the combined synthesis approach employed in this study successfully produced rGO with favorable morphology and promising electrochemical properties, highlighting its potential for energy storage applications such as supercapacitors.
Co-Authors Annisa Alfa Setyawan Deatri Arumsari Agung Gesti Memarista Irawan, Robin Kristanto, Visi Saujaningati Mawasti, Alpi Nugroho, Agung Pardede, Maichel Letare Ratna Frida Susanti Yuniarto, Antonius