Thong Quang TrinhHanoi University of Science and Technology · Engineering Physics
Thong Quang Trinh
Doctor of Philosophy
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20
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Publications (20)
In this work, n-type Ga-doped ZnO (GZO)/reduced graphene oxide (rGO) thin-film nanocomposites were investigated as an approach to enhancing the electron transport of a popular material having weak thermoelectric properties. Namely, the rGO contents of 1, 3, 5, and 7 wt% were mixed in the matrix of chemically derived GZO. The XRD, Raman, XPS spectro...
An experimental setup was developed for the simultaneous measurements of the electrical resistivity and Seebeck coefficient of ZnO-based thin films in the range from room temperature up to 400 °C (673 K). The main device of measurement setup including a heater integrated with a temperature sensor so-called resistance temperature detector (RTD) made...
This work presents the study results of zinc oxide (ZnO) thin films doped with elements of group IB, namely silver (Ag) and copper (Cu). The films were deposited on the Corning 1737F glass substrate using the solutions derived by sol-gel method. Effect of Ag and Cu doping on structural, surface morphology, and electrical properties were investigate...
This paper presents a study on ZnO-based n-type thin films doped with Al, Ga, and Sn deposited on the glass substrates, using the solution derived by sol–gel reactions. The basic material properties associated with using the alternative chemical substances in synthesis process and different dopants to generate n-type conductivity in ZnO-based thin...
Sn-doped n-type and Cu-doped p-type ZnO films were fabricated by depositing solutions derrived by sol–gel route on glass substrates through dip-coating cycles. The X-ray diffractometry demonstrates the typical crystalline structure of hexagonal wurzite of ZnO. The surface morphology was made through scanning electronmicroscopy showing the density a...
Aluminum doped zinc oxide (AZO) thin films have become technologically important materials due to their application potential for thermoelectric devices. In this paper, AZO thin films are deposited on the glass substrates using the solution derived by sol–gel route for dip-coating cycles and the radio-frequency sputtering process. The crystalline s...
This paper presents a systematic investigation of typical characterizations of Sr(1-1.5x-0.5y)DyxTi1-yNbyO3 composition based on single Nband Dy-doped as well as Nb/Dy co-doped SrTiO3. Nb concentration of 10, 13, 17, 20 and 24 at% and Dy concentration of 4, 8, 10, and 13 at% were used for different doping compounds. XRD data was used to calculate t...
Lead zirconate titanate Pb(Zr0.52Ti0.48)O3 (undoped PZT) and doped PZT thin films with thickness of about 500 nm were grown on Pt/Ti/SiO2/Si substrates by pulsed laser deposition (PLD). In this study, 1.0 mol% Nb-doping (at Zr/Ti site) as donor, 1.0 mol% Fe-doping (at Zr/Ti) as acceptor and 10 mol% Ba-doping (at Pb site) as isovalence were used. Th...
This paper presents design and analysis of a z-axis tuning fork gyroscope. The sensor is designed to reduce noises and improve the sensitivity by using a drive coupling spring in the lozenge shape. The in-phase sensing mode is suppressed by using a self-rotation ring. The designed sensor prioritizes anti-phase driving and sensing modes. The frequen...
The controlled synthesis of mesoporous silica and metal oxide nanocomposites with a highly ordered porous structure and large specific surface area for specific applications has been an attractive topic in the field of porous materials. Herein, we introduce a novel method for the fabrication of highly ordered mesoporous structured and large specifi...
This paper reports the latest experimental results of multilayered, heterolayered, and alternating heterolayered PZT thin films obtained by spin coating on Pt/Ti/SiO2/Si wafers using Zr-rich (P60) and Ti-rich (P40) solutions which were prepared by sol–gel route process. The ferroelectric and piezoelectric properties of the heterolayered and alterna...
Hydrogels are water-swollen polymeric materials that maintain a distinct
three-dimensional structure. Manipulation of hydrogel structure has produced stimuli-
sensitive hydrogels, which change their swelling degree or undergo phase transition in re-
sponse to minimal changes in environmental conditions. This paper presents the develop-
ment of hydr...
This paper presents the investigations of a novel type of piezoresistive pH sensors exploiting the chemo-mechanical energy
conversion due to hydrogel swelling. pH-sensitive poly(vinyl alcohol)-poly(acrylic acid) (PVA-PAA) hydrogel is used for this
aim. The pH sensor has been designed including a commercial piezoresistive pressure sensor chip, a hyd...
The paper summarizes a detailed design study of silicon piezoresistive pH sensors, whose operation relies on the pH sensitive swelling of a polymer hydrogel. It is based on an analytical model of the hyperelastic–viscous behaviour of hydrogel. The pH sensor behaviour was investigated by simulating and measuring the silicon membrane deflection and t...
This paper presents the investigations of a novel type of piezoresistive pH sensors exploiting the chemo- mechanical energy conversion due to PVA/PAA hydrogel swelling. The sensor structure consists of three parts including a commercial piezoresistive pressure sensor chip, a hydrogel layer, and a rigid grid. The sensor behaviour comprising membrane...
Hydrogele zeigen in Abhängigkeit von der sie umgebenden Flüssigkeit ein starkes Quellungsvermögen. Dies kann für die Schaffung chemischer Sensoren, z.B. für die Messung des pH-Wertes, ausgenutzt werden. Dafür lassen sich piezoresistive Sensoren nutzen, wobei das quellende Hydrogel zu einer Verformung der Silizium-Biegeplatte des Sensorchips führt....