Investigation of the Mode Structures of Multiphoton Induced Ultraviolet Laser in a ZnO Microrod

Hexagonal wurtzite structural ZnO microrods were fabricated by vapor-phase transport method. Under the excitation of a pulse laser with 1200 nm wavelength, the multiphoton induced ultraviolet (UV) laser was observed in a microrod. The dependence of the laser mode structures on pump intensity was investigated. The result indicates that the laser belongs to whispering gallery mode (WGM) at low pump intensity and Fabry-Perot (FP) mode at high pump intensity. The corresponding positive feedback mechanisms were discussed.

Insights into the growth of small-sized SAPO-34 crystals synthesized by a vapor-phase transport method

Under VPT conditions, a dry gel derived from a conventional hydrogel (or an ultrasonically treated hydrogel) can be converted into SAPO-34 crystals around 300–500 nm (or below 100 nm).

Enhanced field emission properties of ZnO nanorods by surface modification

ZnO nanorods on Si substrates were synthesized by a simple vapor phase transport method, and FE property of these ZnO nanorods was improved by a two-step surface modification process.

Crystallization and catalytic properties of molecular sieve SAPO-34 by a vapor-phase transport method

Formation of SAPO-34 was examined by the VPT method.

Fast Synthesis of High-Silica ZSM-5 Zeolite via a Simple Vapor-Phase Transport Method

Fast synthesis of high-silica ZSM-5 zeolite through vapor-phase transport (VPT) method was reported in this paper. The synthesized samples were characterized with XRD, FT-IR, XRF, SEM and N2 Absorption. Factors affecting the synthesis of ZSM-5 zeolite such as the alkalinity, the crystallization temperature and time, the quantity of seeds were investigated. With precipitated silica and fumed silica as silica source respectively, the appropriate ratio was studied as follows: (0.04-0.05) Na2O: 1.0SiO2: 15H2O: (0-0.0046)Al2O3: 0.01Seed, the reaction was carried out at 393-413K for 4-24h.