Doping

In this study, spinel ferrite nanoparticles CoFe2-xLaxO4 (x = 0, 0.025, and 0.05) were successfully synthesized via a simple co-precipitation method using a 5% NaOH solution as a precipitating agent. The physicochemical properties of the materials, annealed at 850 °C for one hour, were characterized using powder X-ray diffraction (PXRD), energy-dispersive X-ray spectroscopy (EDX), transmission electron microscopy (TEM), and vibrating-sample magnetometry (VSM) at room temperature.

10p viling 11-10-2024 1 0   Download

This study aims to contribute to the development of a GaN/Ga2O3 diode that can be utilized in high-power device applications. The simulated device is calibrated against experimental GaN and Ga2O3 diodes, considering the effect of thickness of GaN layer and its doping concentration on the performance of GaN/Ga2O3 diodes. The band structures of devices are investigated to revial which factors that affect the properties of GaN/Ga2O3 diode.

6p viling 11-10-2024 3 1   Download

Uniform and magnetic recyclable hollowsphere Zn doped Fe3O4 were successfully synthesized via simple one-pot solvothermal route. Morphology and structure of as-obtained products was characterized by XRD, SEM, HRTEM methods. The Zn-doped Fe3O4 hollowsphere exhibited high photocatalytic activity for degradation of hexavalent chromium under visible light irradiation.

5p vikwong 29-09-2024 2 1   Download

The Mn-doped MoS2 (Mn-MoS2) material is fabricated by a facile onestep calcination method. The Mn2+ content introduced into MoS2 is ranged from 1 wt% to 7 wt%. The X-ray diffraction (XRD) and scanning electron microscopy SEM results suggest that the doping of Mn2+ does not alter the crystal structure and the morphology of MoS2.

5p vikwong 29-09-2024 2 1   Download

Bài viết trình bày các kết quả nghiên cứu lý thuyết sự hấp phụ 2,4-D trên CNT và CNT biến tính bằng cách doping một số nguyên tử kim loại (Fe,Ag). Những kết quả này có thể cung cấp những hiểu biết ở cấp độ phân tử, làm rõ bản chất quá trình hấp phụ 2,4-D trên CNT và cung cấp những thông tin hữu ích phục vụ cho việc thiết kế vật liệu mới, ứng dụng trong xử lý 2,4-D.

5p vikwong 29-09-2024 6 1   Download

Bài viết trình bày các kết quả nghiên cứu lý thuyết sự hấp phụ DDT trên g-C3N4 và g-C3N4 biến tính bằng cách doping cluster nickel Ni2. Những kết quả này có thể cung cấp những hiểu biết ở cấp độ phân tử, làm rõ bản chất quá trình hấp phụ DDT trên g-C3N4 và Ni2-g-C3N4, đồng thời cung cấp những thông tin hữu ích phục vụ cho việc thiết kế vật liệu mới theo công nghệ hấp phụ - quang xúc tác, ứng dụng trong xử lý DDT.

7p vikwong 29-09-2024 3 0   Download

In this paper, the Au doped Mn1Co9Ox was investigated for total oxidation of CO. The sol-gel method was applied to prepare this catalyst and some modern analysis methods as XRD, EPR, TPx, SEM were utilized to characterize its properties.

7p vikwong 29-09-2024 4 0   Download

In this study, the sol-gel method was successfully used to synthesize S-TiO2 for efficient photocatalytic degradation of Ciprofloxacin solution under visible irradiation. These synthesized materials were characterized by various analytical methods such as XRD, SEM-EDX, FT-IR, and UV diffuse reflectance spectroscopy (DRS).

6p vikwong 29-09-2024 2 1   Download

In this communication, we synthesized the composite of MoO3/TiO2 with hierarchical electronic structure via the facile impregnation combined with calcination of precursors. Beside the forming of composites, the asprepared samples were in a desire of Mo-doping into TiO2 lattice, due to the smaller radius of Mo+6 compared to Ti+4, leading to the reduction of the band gap.

7p vikwong 29-09-2024 3 1   Download

In this study, in-situ method was applied for synthesizing silver-doped graphene oxide (Ag/GO). The material was extensively characterized by X-ray diffraction, Transmission electron microscopy, Scanning electron microscope, Raman spectroscopy, energy-dispersive X-ray spectroscopy, and UV-Vis spectroscopy.

6p vikwong 29-09-2024 4 1   Download

Non-metallic C, N, and S doped TiO2 materials were prepared using the hydrothermal method from titanyl sulfate solution with different doped precursors. The influence of non-metallic elements on crystal structure, morphology, surface area, bonding state, and light absorption ability of materials was studied through XRD, SEM, BET spectra, and UVis - DRS.

5p vikwong 29-09-2024 3 1   Download

This study employs the tight-binding density functional method GFN1-xTB to investigate the structural and electronic properties of TiO2-ZnO and TiO2-ZnO composite materials modified by Li, Na, K, and Fe metals. Computational analyses reveal the formation of weak covalent bonds between the TiO2 and ZnO components within the composite system. Doping TiO2-ZnO with metals induces significant alterations in the electronic structure, particularly in terms of ionization energy and global electrophilic index.

5p vikwong 29-09-2024 2 1   Download

This work investigated the modification of MnOx catalysts by doping various metals (e.g., Cu) and supporting them on cordierite honeycomb ceramics using the impregnation method. The catalysts were characterized by BET, XRD, SEM-EDX, and H2-TPR techniques. The Cu1Mn2Ox catalyst exhibited the best catalytic performance, achieving complete oxidation of benzene and toluene at 275°C with a WHSV of 18,000 mL/(g·h).

6p vikwong 29-09-2024 3 1   Download

This study focuses on the synthesis of V-doped TiO2 materials using a modified polyol method to enhance their efficiency. The obtained materials were characterized by various methods such as XRD, EDX, FTIR, SEM, TEMSAED, Raman, and UV-Vis DRS. The results indicated the crystalline anatase phase of TiO2, with spherical morphology and an average size of 30nm. The UV-DRS measurement demonstrated that doped materials have a lower bandgap than the pristine TiO2.

6p vikwong 29-09-2024 1 1   Download

This work demonstrates an AlGaN/GaN high electron mobility transistor (HEMT) with Cr/Graphene ohmic contacts constructed without heat treatment. The Cr/Graphene ohmic contact was fabricated using a spray-coated graphene nanoflakes solution and electron-beamevaporated Cr. This method does not require a high-temperature annealing step in conventional Ti/Al/Ni/Au ohmic contact. It is suggested that the Cr/graphene combination acts similarly to a doped n-type semiconductor in contact with AlGaN/GaN heterostructures, enabling carrier transport to the AlGaN layer.

8p xuanphongdacy06 18-09-2024 3 1   Download

Thông tư số 01/2024/TT-BVHTTDL quy định về phòng, chống doping trong hoạt động thể thao. Thông tư này áp dụng đối với các tổ chức, cá nhân tham gia hoạt động thể thao, các tổ chức, cá nhân khác có liên quan đến thể thao tại Việt Nam; tổ chức, cá nhân Việt Nam tham gia hoạt động thể thao tại nước ngoài.

9p zizaybay1105 21-06-2024 5 2   Download

In this research, in an attempt to make use of the kaolin resources in Vietnam, we present a synthetic process of zeolite A via hydrothermal from kaolinite, together with the modification process of zeolite A using different metallic cations. The characteristics of the prepared zeolite LTAs such as chemical composition and crystalline structure, as well as their catalytic activity in the methanation reaction of carbon dioxide (CO2) to methane (CH4) were extensively investigated.

8p dianmotminh02 03-05-2024 7 1   Download

In this study, an evaluation of the enantioselective of a chiral flavanone with 2'-OH substitution (5,7,2'- trihydroxyflavanone) on ring C was studied by high performance liquid chromatography using the cellulose tris(3,5- dimethylphenyl carbamate)-based stationary phase with n-hexane and iso-propanol doped with 0.1% (v/v) trifluoroacetic acid as a mobile phase.

6p dianmotminh02 03-05-2024 2 2   Download

Lead-free (Na0.59K0.41)(Nb1-xSbx)O3 ceramic (x = 0 ÷ 0.12) were prepared by the solid phase reaction method. This study aimed to address the need for practical applications by examining the impact of (K0.41Na0.59)NbO3 lead-free.

8p viritesh 02-04-2024 7 3   Download

Trong bài viết này, composite CuO/ZnO/C được tổng hợp bằng phương pháp nhiệt phân trên cơ sở vật liệu ZIF-7 doping Cu(II). Ảnh hưởng của nhiệt độ nung đến thành phần pha của composite cũng đã được khảo sát. Vật liệu tổng hợp được đặc trưng cấu trúc và tính chất bằng các phương pháp: Nhiễu xạ tia X (XRD) và phổ tán sắc năng lượng tia X (EDX).

9p viberkshire 09-08-2023 18 5   Download