Effects of Gas Adsorption Properties of an Au-Loaded Porous InO Sensor on NO-Sensing Properties.

Gas adsorption properties of semiconductor-type gas sensors using porous (pr-) InO powders loaded with and without 0.5 wt % Au (Au/pr-InO and pr-InO sensors, respectively) at 100 °C were examined by using diffuse reflectance infrared Fourier transform spectroscopy, and the effect of the Au loading onto pr-InO on the NO-sensing properties were discussed in this study. We found the following: the resistance of the Au/pr-InO sensor in dry air is lower than that of the pr-InO sensor; the DRIFT spectra of both the sensors show a broad positive band between 1600 and 1000 cm in dry air (reference: in dry N at 100 °C), which mainly originates from oxygen adsorbates and/or lattice oxygen, and that this band is much larger for the Au/pr-InO sensor than for the pr-InO sensor; the Au loading also increases the adsorption amount of HO and the reactivity of NO on the pr-InO surface; and the NO response of the Au/pr-InO sensor in dry air is marginally higher than that of the pr-InO sensor in the examined concentration range of NO (0.

Rhodium Oxide Surface-Loaded Gas Sensors.

In order to increase their stability and tune-sensing characteristics, metal oxides are often surface-loaded with noble metals. Although a great deal of empirical work shows that surface-loading with noble metals drastically changes sensing characteristics, little information exists on the mechanism. Here, a systematic study of sensors based on rhodium-loaded WO₃, SnO₂, and In₂O₃-examined using X-ray diffraction, high-resolution scanning transmission electron microscopy, direct current (DC) resistance measurements, operando diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy, and operando X-ray absorption spectroscopy-is presented.

High density FTA plates serve as efficient long-term sample storage for HLA genotyping.

Storage of dried blood spots (DBS) on high-density FTA(®) plates could constitute an appealing alternative to frozen storage. However, it remains controversial whether DBS are suitable for high-resolution sequencing of human leukocyte antigen (HLA) alleles. Therefore, we extracted DNA from DBS that had been stored for up to 4 years, using six different methods.