A5054714635- Graphene research and applications
- Physics of Superconductivity and Magnetism
- 2D Materials and Applications
- Electronic and Structural Properties of Oxides
- Advanced Condensed Matter Physics
- Quantum and electron transport phenomena
- Perovskite Materials and Applications
- Magnetic and transport properties of perovskites and related materials
- Legal and Social Justice Studies
- Graphene and Nanomaterials Applications
- Conducting polymers and applications
- Magnetic properties of thin films
- Gold and Silver Nanoparticles Synthesis and Applications
- Supercapacitor Materials and Fabrication
- Quantum Dots Synthesis And Properties
- Legal Studies and Policies
- Computer Science and Engineering
- Semiconductor materials and devices
- Topological Materials and Phenomena
- Indonesian Legal and Regulatory Studies
- ZnO doping and properties
- Surface and Thin Film Phenomena
- Advanced Thermoelectric Materials and Devices
- Plasmonic and Surface Plasmon Research
- Gas Sensing Nanomaterials and Sensors
Universitas Gadjah Mada
2016-2025
ADA University
2025
Universitas Patria Artha
2022-2024
University of Indonesia
2022-2023
Yogyakarta State University
2023
Jakarta State Polytechnic
2023
State University of Makassar
2020
Siliwangi University
2019
Udayana University
2018
National University of Singapore
2010-2017
We report direct evidence of room-temperature ferromagnetic ordering in O-deficient ZnO:Cu films by using soft x-ray magnetic circular dichroism and absorption. Our measurements have revealed unambiguously two distinct features Cu atoms associated with (i) magnetically ordered ions present only the oxygen-deficient samples (ii) disordered regular ${\mathrm{Cu}}^{2+}$ all samples. find that a sufficient amount both oxygen vacancies (${V}_{\mathrm{O}}$) impurities is essential to observed...
Synchrotron-based in situ photoelectron spectroscopy investigations demonstrate effective surface transfer p-type doping of epitaxial graphene (EG) thermally grown on 4H–SiC(0001) via the deposition MoO3 thin film top. The large work function difference between EG and facilitates electron from to film. This leads hole accumulation layer with an areal density about 1.0×1013 cm−2, places Fermi level 0.38 eV below Dirac point.
We demonstrated a novel method to obtain charge neutral quasi-free-standing graphene on SiC (0001) from the buffer layer using fluorine molecular source, fluorinated fullerene (C(60)F(48)). The intercalated product is stable under ambient conditions and resistant elevated temperatures of up 1200 °C. Scanning tunneling microscopy spectroscopy measurements are performed for first time such elucidate changes in electronic structural properties both interfacial layer. Novel structures due highly...
Short-chain alcohols are a group of volatile organic compounds (VOCs) that often found in workplaces and laboratories, as well medical, pharmaceutical, food industries. Real-time monitoring alcohol vapors is essential because exposure to with concentrations 0.15–0.30 mg·L−1 may be harmful human health. This study aims improve the detection capabilities quartz crystal microbalance (QCM)-based sensors for analysis vapors. The active layer chitosan was immobilized onto QCM substrate through...
<title>Abstract</title> Developing sensitive and reliable sensors for detecting microalgae is vital various environmental industrial applications. This study investigates the potential of chromium (Cr) thin films as substrates in spectroscopic ellipsometry (SE)-based sensors. Optical properties Cr (20–75 nm) were characterized using SE, showing a strong thickness dependence that directly impacts their suitability sensing technologies. For 75 nm films, optical constants <italic>n</italic>...
Activated carbon from banana peel waste through two stages of hydrothermal (HT) and physical activation processes has been carried out. The process was out at a temperature 200 oC with holding time 2 or 6 hours. hydrochar that had obtained then activated in the second stage nitrogen gas flow (N2) 700 for 1 hour rate 100 mL/min. difference treatment, without HT process, activation, variations activator agents (water, H3PO4, PEG6000), water volume ratio were studied their effects on specific...
Our study investigates the remarkable capacitance performance of a supercapacitor cell featuring electrodes synthesized through liquid-phase exfoliation (LPE) method using environmentally friendly linear alkylbenzene sulfonate (LAS) surfactant. We explored different synthesis temperatures (15, 30, and 90 °C) to evaluate their impact on reducing sonication time. The electrodes, created by drop-casting graphene onto silver plate substrate heated at 50 °C, demonstrated exceptional cyclic...
Using a combination of ultraviolet-vacuum ultraviolet reflectivity and spectroscopic ellipsometry, we observe resonant exciton at an unusually high energy 6.3eV in epitaxial graphene. Surprisingly, the occurs room temperature for very large number graphene layers $N$$\approx$75, thus suggesting poor screening The optical conductivity ($\sigma_1$) scales linearly with layer (up to \emph{at least} 8 layers) implying quantum character electrons Furthermore, prominent excitation 5.4eV, which is...
We report significant changes of optical conductivity (${\ensuremath{\sigma}}_{1}$) in single-layer graphene induced by mild oxygen plasma exposure and explore the interplay between carrier doping, disorder, many-body interactions from their signatures absorption spectrum. The first distinctive effect is reduction excitonic binding energy that can be extracted renormalized saddle point resonance at 4.64 eV. Secondly, ${\ensuremath{\sigma}}_{1}$ nearly completely suppressed...
The effect of spin-orbit coupling on the electronic properties monolayer (ML) ${\mathrm{PtSe}}_{2}$ is dictated by presence crystal inversion symmetry to exhibit a spin-polarized band without characteristic spin splitting. Through fully relativistic density-functional theory calculations, we show that large splitting can be induced introducing point defects. We calculate stability native defects such as Se vacancy (${\mathrm{V}}_{\text{Se}}$), interstitial (${\mathrm{Se}}_{i}$), Pt...
The established spin splitting in a monolayer (ML) of transition metal dichalcogenides (TMDs) induced by inversion symmetry breaking is dictated mirror operations to exhibit the fully out-of-plane direction polarization. Through first-principles density functional theory calculations, we show that polarity inducing leads sizable having in-plane These splittings are effectively controlled tuning using biaxial strain. Furthermore, admixtures between and spin-polarized states strained polar...
The recent epitaxial growth of the $1T$ phase ${\mathrm{PtSe}}_{2}$ monolayer (ML) has opened possibility for novel applications, in particular a spintronics device. However, contrast to $2H$ transition-metal dichalcogenides (TMDs), absence spin splitting ML may limit functionality application. Through fully relativistic density-functional theory calculations, we show that large can be induced by introducing substitutional halogen impurity. Depending on atomic number $Z$ dopants, observe an...