Atiwongsangthong, Narin
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Preferred name
Atiwongsangthong, Narin
Alternative Name
Atiwongsangthong, N.
Main Affiliation
Email
narin.at@kmitl.ac.th
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Item type:Publication, A planar nanoporous silicon metal-semiconductor-metal visible light photodetector(2013-11-01)In this work, the nanoporous silicon layer is prepared through the simple electrochemical etching of p-type crystalline silicon wafer in a hydrofluoric acid solution under various anodization conditions such as the resistivity of the silicon wafer, current density, concentration of the hydrofluoric acid solution and anodization time. The gravimetric method and SEM images have been used to characterize the morphological on the various porosity of nanoporous silicon layer. Two square Al Schottky contacts were thermally deposited on the nanoporous silicon layer with the electrode spacing is 500 μm to form a planar nanoporous silicon metal-semiconductor-metal (MSM) visible light photodetector. In experiment, we investigated photoresponse and the response time of a planar nanoporous silicon MSM visible light photodetector which was fabricated on the various porosity of a nanoporous silicon layer. It is found that when devices are fabricated on a higher porosity nanoporous silicon layer, the photoresponse of the device will expand toward the shorter-wavelengths and the bandwidth of the spectrum response will cover visible light. In addition, it is found that the response time of the device decreases. © 2013 American Scientific Publishers All rights reserved. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Water Repellent Modified Polyester Fabric Based Triboelectric Nanogenerator for Harvesting Human Mechanical Energies(2021-01-01); Wearable triboelectric nanogenerators (TENGs) for converting human mechanical energies into electricity are being investigated widely, because of their potentially diverse applications that come from wearable power supplied to multifunctional self-powered sensing. However, external influences, such as water or high humidity, seriously degrade the electrical output of TENGs. Therefore, a simple method was implemented for fabricating a water repellent fabric-based TENG for harvesting human mechanical energies. Polytetrafluoroethylene (PTFE) or SiO<inf>2</inf> modified by trichloro(octadecyl)silane (OTS) were sprayed onto a polyester (PET) fabric surface to increase hydrophobicity. The PTFE and SiO<inf>2</inf>/OTS coated polyester fabrics exhibited excellent water repellency with a high-water contact angle of ∼144° and ∼153°, respectively. The surface morphology of the coated fabrics showed roughness with a granular structure, which was responsible for air entrapment that prevented water from penetrating the fabric. Furthermore, electrical output of conventional PET fabric-based TENG was found to improve with the deposition of PTFE particles on the fabric surface. By pairing the PTFE coated fabric with aluminum (Al) tape, in order to fabricate TENG, the device generated a maximum voltage of 10.2 V and short-circuit current of 0.20 µA, with a power output of 0.23 (Formula presented.) W/cm<sup>2</sup>, which is 14 times greater than that of SiO<inf>2</inf>/OTS coated fabric-based TENG. The process for achieving water repellent fabric is simple, and the coating materials are available. Thus, a water repellent fabric-based TENG is promising for large-scale production of wearable harvesters from power supplied to multifunctional self-powered sensing. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Synthesis of monodispersed perovskite barium zirconate (BaZrO3) by the sonochemical method(2013-01-01); ; Muanghua, RangsonBarium zirconate (BaZrO<inf>3</inf>) was synthesized successfully by the sonochemical method. The monophase of BaZrO<inf>3</inf> was formed completely in short irradiation time without the calcination process. X-ray diffraction, Fourier transform and Raman spectroscopy were used to characterize formation of the perovskite BaZrO<inf>3</inf> phase, which occurs in a 60 minute single phase with a cubic crystal structure at room temperature. Therefore, sonochemical irradiation could accelerate the formation of BaZrO<inf>3</inf> particles significantly. Furthermore, scanning electron microscopy investigated the uniform shape and size. The size distribution became narrow with increasing time, as a function of irradiation. © 2013 Copyright Taylor and Francis Group, LLC. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, The study of trivalent-dopants effect on electrical properties of the BaZr0.7In0.3O3-δ system(2019-01-02); ; ; Perovskite BaZrO<inf>3</inf> and BaZr<inf>0.7</inf>In<inf>0.3</inf>O<inf>3-δ</inf> (BZI) ceramics were prepared via solid-state reaction. The crystal structure, dielectric and electrical properties of these ceramics were analyzed comparatively. Rietveld analysis indicated that BaZrO<inf>3</inf> and BaZr<inf>0.7</inf>In<inf>0.3</inf>O<inf>3-δ</inf> (BZI) have cubic symmetry with the Pm (Formula presented.) m space group. A small amount of In<inf>2</inf>O<inf>3</inf> was observed in the BZI ceramic. The lattice parameter (a) decreased when a small amount of In<sup>3+</sup> was added. The relative permittivity ε<inf>r</inf>(T) and tan δ(T) of BZ and BZI ceramics behaved as plateaus that were independent of frequency and temperature in a temperature range of below 150 ̊C and 50 ̊C, respectively, which ascribed to the intrinsic dielectric properties resulting from electronic and/or ionic polarization. By increasing the temperature further, both ceramics exhibited colossal dielectric constant (CDC) behavior. Conductivity was greater with increasing temperature, which corresponded to Arrhenius behavior. Activation energies were calculated as 0.522 and 0.620 eV for the BZI and BZ system, respectively.