N-doped MgZnO alloy thin film prepared by sol-gel method

In this work, nitrogen-doped MgZnO thin films were deposited on glass substrate by spin-coating technique and thermal annealing treatment. The X-ray diffraction (XRD), scanning electron microscope (SEM) and optical transmission measurement were carried out to investigate the effect of growth temperature and nitrogen doping on the physical and optical properties of the films. XRD and SEM results revealed that the crystallinity and preferred c-axis orientation was enhanced with increasing annealing temperature and certain concentration of N-doping. In addition, the films incorporated with nitrogen doping exhibit significant blue shift in optical band gap and improvement in its transparency.     

Microwave-assisted synthesis of ZnO/MWCNT hybrid nanocomposites and their alcohol-sensing properties

Zinc oxide and multi-walled carbon nanotube (ZnO/MWCNT) hybrid nanocomposites were synthesised by microwave-assisted method using the mixed solution of zinc acetate dehydrate (Zn(CH₃COO)₂·2H₂O) and treated MWCNTs. The syntheses were carried out at various microwave irradiation powers. The characterisation of the as-synthesised nanocomposites was conducted by powder X-ray diffraction (XRD) and scanning electron microscopy (SEM). The XRD results revealed that the composites were composed of two phases of MWCNTs and hexagonal wurzite ZnO. The SEM results showed that the ZnO nanoparticles were well decorated on the surface of MWCNTs. The amount of ZnO nanoparticles and their size increased with increasing irradiation power. Thick-film sensors were fabricated onto interdigitated conducting electrodes using as-synthesised hybrid composites as sensing materials. The alcohol-sensing behaviour of the hybrid composite films was investigated. The results indicated that the irradiation power had significant influence on the sensing response of the sensors toward alcohol. The sensor fabricated from the composite synthesised at higher irradiation power exhibited an enhanced alcohol-sensing performance.     

Today and Yesterday for Lacquerware art and industry in Thailand

在泰国,漆器艺术和生漆工业已经成为一个重要且多交叉的学科。在泰国传统工艺品的制作过程中,工匠们所使用的生漆主要从Gluta usitata和Gluta laccifera等漆树采取,部分则是从中国进口,系Rhus verniciflua等漆树所产生漆。传统的泰国生漆工艺包括印刷技术、螺钿和珍珠镶嵌技术,以及建筑装饰工程、雕塑等领域。由于生漆是从漆树获得,所以泰国政府的禁止伐木政策致使生漆的产量非常低,已经成为泰国生漆工艺和生漆工业发展的桎梏。本文就泰国生漆的历史、生漆工艺的沿革、生漆工业的发展、漆树的品种以及存在的问题作了综述,并展望了泰国生漆的将来,使读者对泰国的生漆发展史有个较为具体的了解。     

The Coulomb interaction and volume compression effect on spin and orbital magnetic moment of NiO

This calculation focuses on the effect of the Coulomb interaction U and the volume compression (VC) on both spin (m(s)) and orbital (m(o)) magnetic moment of NiO by using the local spin density approximation plus the Coulomb interaction (LSDA + U) method within full potential linear muffin-tin orbital (FP-LMTO). Our calculated results indicated that both spin and orbital magnetic moment strongly correlated to U and VC. The relevant results exhibited the increasing spin and orbital magnetic moments with increasing Coulomb interaction and decreasing volume compression. The interesting behavior appears when volume compression is greater than 70% at which m(s) collapses whereas m(o) linearly decreases. Further increase of volume compression to be at 80% leads to the disappearance of both magnetic moments. The present results exhibit the good correspondence to the experimental data at the normal pressure and U value of 6 eV.