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Featured researches published by Liu Kin Men.


AIP Conference Proceedings | 2018

Synthesis and characterization of ZnO:Ca2+ prepared by simple solution method

Heraldo Yanindra Pradana; I Made Joni; Liu Kin Men; Yayah Yuliah; Lukman Nulhakim; Vanitha Muthukanan; Camellia Panatarani

This paper reports the synthesis and characterization of calcium doped zinc oxide by simple solution method. ZnO:Ca2+ was prepared from zinc acetate dehydrate and calcium nitrate tetrahydrate with Ca2+ concentration were 1, 3, 5, 7 and 10 at% of Zn. The obtained sample was characterized by x-ray diffraction, scanning electron microscopy, electron dispersive spectroscopy and photoluminescence spectroscopy. The XRD spectra showed that the obtained samples has a hexagonal wurtzite crystal that rate corresponding to JCPDS 36-1451 diffraction data with a slightly distorted ZnO lattice. The PL spectrum of ZnO:Ca2+ showed high intensity of violet to blue emission.This paper reports the synthesis and characterization of calcium doped zinc oxide by simple solution method. ZnO:Ca2+ was prepared from zinc acetate dehydrate and calcium nitrate tetrahydrate with Ca2+ concentration were 1, 3, 5, 7 and 10 at% of Zn. The obtained sample was characterized by x-ray diffraction, scanning electron microscopy, electron dispersive spectroscopy and photoluminescence spectroscopy. The XRD spectra showed that the obtained samples has a hexagonal wurtzite crystal that rate corresponding to JCPDS 36-1451 diffraction data with a slightly distorted ZnO lattice. The PL spectrum of ZnO:Ca2+ showed high intensity of violet to blue emission.


arXiv: Materials Science | 2013

Optical properties of amorphous silicon quantum dots (a-Si QDs) with various dot size using extended Hückel theory

Setianto; Liu Kin Men; Ferry Faizal; Bambang Mukti Wibawa; Doy Hardoyo Hardjo; Camellia Panatarani; I Made Joni

A high quality amorphous silicon (a-Si) nanostructures has grown experimentally to study the origin of light emission and the quantum confinement effect in a-Si. The quantum confinement effect increases the band gap of material as the size of quantum structure decreases, which results in a blue shift in optical luminescence and energy absorption. Here we demonstrate this effect using extended Huckel method to calculate fundamental band gap and optical absorption energy of a-Si samples with various dot sizes. As result, when the dot size was decreased from 2.2 to 1.0 nm, the absorption spectra peak shifted toward higher energy from 2.278 eV to 3.856 eV.


PADJADJARAN INTERNATIONAL PHYSICS SYMPOSIUM 2013 (PIPS-2013): Contribution of Physics on Environmental and Energy Conservations | 2013

Improvement on droplet production rate of ultrasonic - nebulizer in spray pyrolysis process

Camellia Panatarani; Tuti Aryati Demen; Liu Kin Men; Dwindra Wilham Maulana; Darmawan Hidayat; I Made Joni

Atomization is an important part in Spray Pyrolysis (SP) process which is applied to synthesize submicron or nano sized particles or to deposit thin film. Ultrasonic Nebulizer (UN) is usually use in SP due to its homogeneous droplets production with size between 1-5 μm. The drawback of the UN is low droplets production rate. In this research, we successfully developed a Digital Ultrasonic Nebulizer (DUN) with high droplets production rate using two ultrasonic traducers with applied frequency of 2.4 MHz. The result of DUN atomization was improved 4-6 fold compare to the conventional UN. The DUN also has an additional digital features such as pushbutton, LCD and microcontroller which is allow to set duration and applied voltage.


Jurnal Teknologi Rekayasa | 2018

Analisis Korosi Retak Tegangan pada Pipa Baja Karbon dalam Larutan Asam dan Sweet Gas

Nendi Suhendi Syafei; Darmawan Hidayat; Bernard Y. Tumbelaka; Liu Kin Men


Jurnal Ilmu dan Inovasi Fisika | 2018

Analisis Korosi Pipa Baja Karbon API 5L-X65 dengan Metoda Pembebanan Tiga Titik pada Lingkungan Gas H2S Kondisi Jenuh CO2 dalam Larutan Asam Asetat.

Nendi Suhendi; Darmawan Hidayat; Liu Kin Men; Setianto Setianto


Prosiding SENIATI | 2017

ANALISA LAJU KOROSI PADA PIPA BAJA KARBON API 5L-X65 DENGAN METODA PEMBEBANAN TIGA TITIK PADA LINGKUNGAN GAS H2S KONDISI JENUH CO2 DALAM LARUTAN ASAM ASETAT

Nendi Suhendi Syafei; Darmawan Hidayat; Bernard Y. Tumbelaka; Zaida Zaida; Liu Kin Men


Archive | 2017

Laju Korosi Pada Pipa Baja Karbonapi 5l-X65 dengan Metoda Tiga Titik Pembebanan pada Larutan Asam Asetat dengan Diisi Gas CO2 dan H2S dalam Keadaan Jenuh

Nendi Suhendi Syafei; Darmawan Hidayat; Bernard Y. Tumbeleka; Liu Kin Men


Jurnal Ilmu dan Inovasi Fisika | 2017

Energi Total Keadaan Dasar Atom Berilium dengan Teori Gangguan

Liu Kin Men; Setianto Setianto; Bambang Mukti Wibawa


Jurnal Ilmu dan Inovasi Fisika | 2017

Pengaturan Lampu Lalulintas Berbasis Fuzzy Logic

Setianto Setianto; Liu Kin Men; Bambang Mukti Wibawa; Darmawan Hidayat


Jurnal Ilmu dan Inovasi Fisika | 2017

Desain dan Pemodelan Sistem Pembangkit Listrik Berbasis Polisi Tidur (studi pengaruh variasi kecepatan kendaraan terhadap respon speed bump model massa-pegas-peredam)

Setianto Setianto; Liu Kin Men; Andri Abdurrochman

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I Made Joni

Padjadjaran University

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