- Thesis
Authors: Vũ, Tiến Dũng; Advisor: Phạm, Tiến Thanh; Bui, Nguyen Quoc Trinh (2020) - This master thesis aims at: Fabricating the photo-thermal conversion (PTC) material from natural sources by the carbonization method. Studying on the PTC characteristics. Evaluating the absorption of bio-metamaterial under the sunlight. Developing a SSG system, using bio-metamaterial as a absorber layer (will mention in the chapter 2). SSG system evaluation: Assessing the evaporation capacity of the system. Demonstration in producing clean water from saline water using the Solar Steam Generation system, which is based on solar energy, bio-inspired materials with light absorbability and one-dimensional capillary sheets with high efficiency
|
- Thesis
Authors: Nguyen, Van Dung; Advisor: Bui, Nguyen Quoc Trinh (2018) - Recently, metal oxide based thin film transistors (TFTs) have attracted
significant attention for application in display industry, for examples, flexible
display, and flat panel display because of their excellent performances. In covalent
semiconductor consisting of sp3 orbital, the bond angle significantly affects to
charge transport in the bottom of the conduction band, leading to low mobility and
unsteady of silicon-based TFTs. However, the overlap between neighbor metal ns
orbital in metal oxide semiconductor could happen in an amorphous phase because
the carrier transport paths include both metal ns orbitals, which lead to high charge
carrier mobility in amorphous structu...
|
- Thesis
Authors: Đặng, Thị Mỹ Nga; Advisor: Bui, Nguyen Quoc Trinh (2022) - Both ZnO and CuO nanoparticles are known as substances belonging to the group of nutrients in plants. Nanoforms of micronutrients improve their bioavailability and significantly increase the growth of plants. Here, Zn element is one of the major metals which participating in plants’ enzymatic activities. On the other hand, a small amount 2 of Cu needed to function in various metalloproteins and metabolic, which involved in the growth process. Recently, CuO and ZnO nanoparticles were found as key factors against Gram-positive and Gram-negative bacteria and antifungal activity, respectively [3,4]. However, the specific effects of ZnO and CuO depend on their bioavailability, concentratio...
|
- Article
Authors: Nguyen, Quang Hoa; Bui, Nguyen Quoc Trinh (2018) - Lanthanum nickel oxide LaNiO3 (LNO) isextensively known as one of typical perovskite-structured materials with metallic conductivity, which is suitable for the electrode application in electronic devices such as transistors or solar cells. Since LNO is a low-cost material and a simple fabrication process, it has been attracted much attention for commercialization. In this paper, we have focused on optimizing the fabrication process of LNO thin films on SiO2/Sisubstrate and Al foil by using asolution process. The crystal structure and surface morphology were characterized by using X-ray diffraction and field-emission scanning electron microscopy (FE-SEM), respectively. It was found tha...
|
- Article
Authors: Nguyen, Quang Hoa; Bui, Nguyen Quoc Trinh (2018) - Lanthanum nickel oxide LaNiO3 (LNO) isextensively known as one of typical perovskite-structured materials with metallic conductivity, which is suitable for the electrode application in electronic devices such as transistors or solar cells. Since LNO is a low-cost material and a simple fabrication process, it has been attracted much attention for commercialization. In this paper, we have focused on optimizing the fabrication process of LNO thin films on SiO2/Sisubstrate and Al foil by using asolution process. The crystal structure and surface morphology were characterized by using X-ray diffraction and field-emission scanning electron microscopy (FE-SEM), respectively. It was found tha...
|
- Article
Authors: Bui, Nguyen Quoc Trinh (2019) - A novel concept of NAND memory array has been proposed by using only ferroelectric-gate thin film transistors (FGTs), whose structure is constructed from a sol-gel ITO channel and a sol-gel stacked ferroelectric between Bi3.25La0.75Ti3O12 and PbZr0.52TiO0.48O3 (BLT/PZT) gate insulator. Interestingly, ferroelectric cells with a wide memory window of 3 V and a large on/off current ratio of 6 orders, have been successfully integrated in a NAND memory circuit. To protect data writing or reading from disturbance, ferroelectric transistor cells are directly used, instead of paraelectric transistor cells as usual. As a result, we have verified disturbance-free operation for data reading and ...
|
- Article
Authors: Hoang, Ha; Bui, Nguyen Quoc Trinh (2017) - PbZr0.4Ti0.6O3 (PZT) thin films have been conventionally fabricated on traditional silicon substrates with a platinum bottom electrode; however, as a consequence of unit cell mismatch, the films are difficult to form as an epitaxial-like growth. Hence, PZT films deposited on single-crystal niobium doped SrTiO3(111) substrates (Nb:STO) are promising to solve this issue thanks to the similar perovskite structure between PZT and STO. Essentially, Nb:STO material is a conductor, playing a part in both bottom electrode and epitaxial substrate. In this work, 200-nm-thick PZT films were successfully fabricated on Nb:STO substrates by a solution process. One obtained that PZT(111) peak starte...
|
- Article
Authors: Do, Hong Minh; Vu, Thi Huyen Trang; Bui, Nguyen Quoc Trinh (2014) - We have demonstrated ferroelectric-gate thin film transistors (FGTs) using solution-processed indium tin oxide (ITO) film as an oxide-semiconductor channel and Pb1.2Zr0.4Ti0.6O3 ferroelectric film as a gate insulator on a poly-crystalline 100-nm-STO/SiO2/Si substrate or a single-crystalline STO(111) wafer. The FGTs show a clear memory function with an on/off current ratio of more than 105 and a memory window of 2 V. It is interesting that even using solution-processed ITO channel, the saturated “on” current in the FGT reached as high as 4.6 mA at operation voltages of 8 V, corresponding to a field-effect mobility of 8.0 cm2/Vs, for the case of single-crystalline STO(111) wafer. The la...
|
- Journal Article
Authors: Bui, Nguyen Quoc Trinh; Truong, Dinh Chien; Nguyen, Quang Hoa; Do, Hong Minh (2020) - Al doped zinc oxide (AZO) thin films are attempted to be formed on glass substrates via solution processing with 0, 0.5, 1, 2, 3, and 4 at% Al doping concentrations. Analysis of X-ray diffraction patterns and scanning electron microscopy micrographs indicate that the AZO thin films belong to the wurtzite hexagonal structure with (100), (002), (101), (102), (110), (103), (112) and (201) orientations, and show that the grain size of AZO thin films decreases with higher Al doping concentrations. Optical and electrical properties of the AZO thin films are characterized from using a UV/vis spectrometer and a four-probe measurement system, respectively. The AZO thin films obtained have a mi...
|
- Thesis
Authors: La, Thi Ngoc Mai; Advisor: Bui, Nguyen Quoc Trinh; Nguyen, Hoang Luong (2021) - In this thesis, CuO thin films doped with transition metal ions Ni were fabricated by the solution-processed method. Using the spin-coating process, thin films with various Ni doping ratios were coated on glass and ITO substrates. The structural, morphological, optoelectrical and magnetic characteristics of the thin films are all studied. The achievement results pointed out that the Ni-doped CuO films obtained can be considered for a channel of thin film transistors or the applications in spintronic devices and noise suppressors.
|
- Theses
Authors: Lê, Thị Hiền; Advisor: Bui, Nguyen Quoc Trinh (2019) - In this study, CZO thin films, whose doping concentrations varied at 0%,
0.5%, 1.0%, 1.5% and 2.0%, were successfully fabricated by using sol-gel method.
The annealing temperatures were 400oC, 450oC, and 500oC for all concentration
conditions. XRD results revealed that the preferential orientations of CZO thin
films are along with (100), (002) and (101). The best crystallization is corresponded
to dopant concentration of 0.5%, and annealing temperature of 500oC. SEM
observation indicates that the grain size is relatively uniform, but the surface
morphology is porous. Also, the grain size is inversely proportional to Copper (Cu)
doping concentration, but directly proportional t...
|
