Article Per Year (5 Year)
p-Index From 2021 - 2026
0.444
P-Index
This Author published in this journals
All Journal Indonesian Journal of Chemistry
Alosfur, Firas Kamel Mohamad
Unknown Affiliation
Chemical Engineering, Chemistry & Bioengineering Chemistry

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

Found 2 Documents
Search

 1 
Preparation of Au-Doped Two-Phase TiO2 Nanoparticles by One-Step Method as Photocatalytic Applications Neama, Rasha Jameel; Alosfur, Firas Kamel Mohamad; Tahir, Khawla Jemeal; Ridha, Noor Jawad; Ahmed, Luma Majeed
Indonesian Journal of Chemistry Vol 24, No 4 (2024)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.92687

Abstract

The synthesis of pure TiO2 and X% Au/TiO2 NPs was achieved via a sol-gel technique. The influence of Au concentration on structural, morphological, and optical features, as well as photocatalytic activity, was studied. XRD analysis revealed the presence of crystallized titanium consisting of anatase and rutile phases. The surface composition and electronic structure of TiO2 and X% Au/TiO2 catalysts were investigated using XPS analysis. Au/TiO2 consists of Ti 2p, O 1s, and Au 4f regions from XPS analysis. FESEM and TEM were utilized to analyze the morphology of the samples. FTIR spectrum indicated the presence of OH, CH2, and Ti–O–Ti groups in TiO2 samples, with an additional peak at 2108.89 cm−1 indicating the presence of gold in X% Au/TiO2 samples. The specific surface area increased from 33.36 m2/g for pure TiO2 to 51.62 m2/g after the doping of 2.5% Au NPs. The incorporation of Au on the TiO2 surface significantly influenced the optical properties in the 490 to 590 nm region, observed through the UV-vis absorption spectrum. The 2% Au/TiO2 NPs exhibited higher catalytic activity than pure TiO2, degrading methylene blue dye by 72.43% within 120 min.
Semiconductor Gas Sensors: Metal Oxides, Synthesis Methods, Applications as Gas Sensors, and Oxidation and Reduction Mechanisms Hammod, Inam Abed; Ridha, Noor Jawad; Tahir, Khawla Jemeel; Alosfur, Firas Kamel Mohamad; Yasir, Asaad Sabbar; Majeed, Luma Ahmed
Indonesian Journal of Chemistry Vol 25, No 1 (2025)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.95018

Abstract

Over the last several decades, advancements in industry have facilitated the absorption of harmful gases into the bloodstream or lungs via dermal absorption or inhalation. This process may elicit diverse cellular responses, potentially leading to adverse health effects. Consequently, air pollution has emerged as a significant worldwide issue. Hence, developing a device capable of monitoring air pollution and detecting these chemicals in the surrounding environment became imperative. Gas sensors are instruments used for regulating industrial emissions, surveillance of environmental contaminants, and identification of pollutants and hazardous gases. Semiconductor gas sensors have garnered significant recognition owing to their several advantageous characteristics, including simplified production processes, compact dimensions, and low-cost. Some of its drawbacks include limited selectivity and high operating temperatures. This review discusses the most often used semiconducting materials in gas sensing, as well as the methods used to synthesize them, and the reduction and oxidation processes that happen between metal oxides and analyte gas. Furthermore, the various strategies employed to increase the gas-sensing response are explored, such as doping with noble metals and the formation of heterostructures.
Co-Authors Ahmed, Luma Majeed Hammod, Inam Abed Majeed, Luma Ahmed Neama, Rasha Jameel Ridha, Noor Jawad Tahir, Khawla Jemeal Tahir, Khawla Jemeel Yasir, Asaad Sabbar