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Preparation of the Transparent Conductive ZnO Nano Material by Means of Pulsed Spray Pyrolysis
Pham Hoang Ngan,Nguyen Quang Tien,Do Thanh Dat,Pham Van Nho 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.5
Transparent conductive ZnO lms play an important role in nano science and nanotechnology. Many methods have had various successes in preparing ZnO. In this contribution, we present some results from using a pulsed spray method and subsequent annealing in a hydrogen atmosphere for the preparation of transparent conductive ZnO films. The performances of ZnO produced by using various precursors and in various technology conditions were investigated. We attained ZnO films with sheet resistances below 100 and an average transparency of about 80 % in the visible region of the light spectrum. Those values are of the same magnitude as ones prepared by using other methods. The mechanism of annealing effect in a hydrogen environment is discussed. Transparent conductive ZnO lms play an important role in nano science and nanotechnology. Many methods have had various successes in preparing ZnO. In this contribution, we present some results from using a pulsed spray method and subsequent annealing in a hydrogen atmosphere for the preparation of transparent conductive ZnO films. The performances of ZnO produced by using various precursors and in various technology conditions were investigated. We attained ZnO films with sheet resistances below 100 and an average transparency of about 80 % in the visible region of the light spectrum. Those values are of the same magnitude as ones prepared by using other methods. The mechanism of annealing effect in a hydrogen environment is discussed.
Pham, Quang Nghia,Trinh, Kieu The Loan,Tran, Nguyen Khoi Song,Park, Tae-Sik,Lee, Nae Yoon The Royal Society of Chemistry 2018 The Analyst Vol.143 No.23
<P>We fabricate a three-dimensional (3D) microdevice operated with minimal peripheral accessories, including a portable pump for semi-automated sample delivery and a single heater for temperature control, for performing reverse transcription polymerase chain reaction (RT-PCR) integrated with a downstream fluorescence detection module for semi-quantitative assessment of gene expression. The microdevice was fabricated by wrapping a polytetrafluoroethylene (PTFE) tube around a pre-designed polycarbonate mold to create a seamless microchannel for both the reverse transcription (RT) of RNA and the amplification of complementary DNA. In addition, a silicone tube, which underwent a two-step surface modification mediated by polyethyleneimine and glutaraldehyde coating, was connected at the outlet to capture amplicons downstream of the PTFE tube for on-site fluorescence detection. This fabrication method enabled continuous-flow RT-PCR (CF RT-PCR) using the 3D CF RT-PCR microdevice as a reactor, a single heater for the temperature control of both RT and PCR processes, and a disposable plastic syringe for semi-automated sample delivery. The microdevice was successfully implemented for the identification of the β-actin gene, a constitutively expressed gene in all cells, and the sphingosine-1-phosphate lyase 1 gene, a potential pharmacological target gene in the diagnosis of cancer, diabetes, and atherosclerosis. This portable integrated microdevice offers a potential approach towards preliminary studies of gene expression and identification of RNA viruses.</P>
2P-390 Stabilization of Cathode-Electrolyte Interface in a High-Voltage Lithium-ion Battery
( Pham Quang Hieu ),( Hee-yeol Lee ),( Young-gil Kwon ),( Eui-hyeong Hwang ),송승완 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
Li-rich and Mn-rich layered oxide cathode material is known to deliver high specific capacities ≥ 250 mAhg<sup>-1</sup> on the high-voltage operation above 4.6 V vs. Li/Li<sup>+</sup> by de-intercalating more number of Li<sup>+</sup> ion. This point makes this material as a promising cathode active material for advanced high-energy density Li-ion batteries. The limited anodic instability of conventional carbonate-based organic electrolytes above 4.2 V vs. Li/Li<sup>+</sup> however makes the attainment of high-capacity difficult. To mitigate the anodic instability problem of conventional electrolyte, we have been developing new high-voltage electrolyte components to stabilize high-voltage interface between Li-rich layered oxide cathode and electrolyte. Studies of high-voltage electrochemical processes and cathode-electrolyte interfacial phenomena and their relations to cycling performance would be discussed.
HELPING TEACHERS DESIGN AND IMPLEMENT INTEGRATED LESSONS IN VIETNAMESE SCHOOLS
Pham Duc Quang APEC국제교육협력원 2017 Asia-Pacific Cybereducation Journal Vol.13 No.2
Education reform is being deployed in Vietnam in the direction of developing learner’s competencies in which integrated teaching is viewed as a practical, effective way to achieve educational goals. However, Vietnamese teachers are not familiar with integrated teaching. Therefore, instructing teachers in how to design integrated lessons and how to implement integrated teaching is necessary and meaningful. This article presents some measures to help teachers design and teach integration in Mathematics.
Pham Hong Quang,유성조 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.5
Magnetic semiconductor Al0:87Mn0:13N thin films were synthesized by DC reactive sputtering at various temperature from 27 to 400℃. The film thickness is topically about 800 nm range. The resistance measured at the temperature range from 120 to 300 K.We present in this report the effect of the substrate temperature and the annealing process on the conductive property of the samples. In all investigated samples, the temperature dependence of the resistivity exhibit a semiconductor behavior, e.g., R exp(Ea=kBT). The values of the activation energy, Ea, obtained from the data ft of the resistance as a function of temperature, decrease with increasing substrate temperature. On the other hand it increase with increasing post-annealing temperature. These behaviors can be attributed to the change in the impurity band dependent on deposition and post-annealing temperature. Magnetic semiconductor Al0:87Mn0:13N thin films were synthesized by DC reactive sputtering at various temperature from 27 to 400℃. The film thickness is topically about 800 nm range. The resistance measured at the temperature range from 120 to 300 K.We present in this report the effect of the substrate temperature and the annealing process on the conductive property of the samples. In all investigated samples, the temperature dependence of the resistivity exhibit a semiconductor behavior, e.g., R exp(Ea=kBT). The values of the activation energy, Ea, obtained from the data ft of the resistance as a function of temperature, decrease with increasing substrate temperature. On the other hand it increase with increasing post-annealing temperature. These behaviors can be attributed to the change in the impurity band dependent on deposition and post-annealing temperature.
Experimental investigation of flow condensation in the micro-fin tube
Pham Quang Vu,Kwang-Il Choi,Jong-Taek Oh,Honggi Cho 대한설비공학회 2018 대한설비공학회 학술발표대회논문집 Vol.2018 No.6
This study experimentally investigated the flow condensation heat transfer characteristics of R410A, R22, R32 and R290 (propane) inside a 7mm OD micro-fin copper tube. The flow condensation heat transfer was measured at mass fluxes of 50 to 380kg/m2s; heat flux of 3 and 12kW/m2; and a saturation temperature of 48oC. The variations of refrigerant mass flux, heat flux with condensation heat transfer performances were obtained. The comparison shows that the heat transfer coefficients of propane are higher than those for R32, R22 and R410A. The different thermophysical properties of the four refrigerants result in the heat transfer coefficient differences.