Chang-Yong Zhan

Effect of electrochemical etching current on prepared perforated silicon structures for neutron detectors

Neutron detector based on perforated silicon structures backfilled with neutron converting materials could be operated at a low voltage and improves the detection efficiency of thermal neutron. It is found that the intrinsic detection efficiency of thermal neutron is affected by a lot of factors such as the geometry, size, and depth of the perforation and so on. In this study, the perforated silicon was prepared by electrochemical etching. Effect of etching current on geometry, size, and depth of the perforated silicon structures for neutron detectors was also reported.

Behaviors of the different dispersers on the morphology of the porous TiO 2 films

TiO<inf>2</inf> films with nano-particles dispersed by using three different additives such as acetylacetone, Emulsifier OP-10 and polyethylene glycol (PEG) respectively. It is found that the TiO<inf>2</inf> films produced at appropriate amount of Emulsifier OP-10 are no re-aggregation of TiO<inf>2</inf> nano-particles with pores of about 5–15 nm. By adding PEG, the pores of the TiO<inf>2</inf> films could be at about 50 nm to 200 nm. But, by using acetylacetone, aggregations of TiO<inf>2</inf> nano-particles always exist in the TiO<inf>2</inf> films. The related mechanism on the aggregation of nano-particles in the TiO<inf>2</inf> slurries is discussed.