Three
PbTiO3 nanostructures were synthesized using a
one-step hydrothermal reaction with different TiO2 powders
as Ti sources, and their gas-sensing properties were investigated.
The sensor comprising PbTiO3 nanoplates (NPs) exhibited
a high response (resistance ratio = 80.4) to 5 ppm ethanol at 300
°C and could detect trace concentrations of ethanol down to 100
ppb. Moreover, the sensor showed high ethanol selectivity and nearly
the same sensing characteristics despite the wide range of humidity
variation from 20 to 80% RH. The mechanism for humidity-independent
gas sensing was elucidated using diffuse reflectance infrared Fourier
transform spectra. PbTiO3 NPs are new and promising sensing
materials that can be used for detecting ethanol in a highly sensitive
and selective manner with negligible interference from ambient humidity.
Based on newly-designed, solution-processable zinc tin oxide semiconductors, the independent contribution of combustive exothermic heat was investigated on chemical/physical structural evolution through spectroscopy analyses along with the interpretation on device performance.
Catastrophic optical damage (COD) in Al-free InGaAs/InGaP 0.98 μm lasers has been investigated using real-time electroluminescence (EL) and transmission electron microscopy (TEM). From EL images, we observed that multiple bright spots initiated from one of the facets and then propagated to the center of the cavity during the COD process. It is clarified by the TEM analysis that the propagation of bright spots resulted in 60-nm-wide Moiré fringe along the cavity and the crystalline phase of the active area became polycrystalline. Highly nonradiative polycrystalline phase of the active area is the major cause of COD failure in the Al-free 0.98 μm lasers.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.