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The low-temperature detection of ammonia gas (NH3) is essential in daily life and environment protection. In this work, Au nanoparticle–functionalized ZnSnO3 cubes have been synthesized by a simple solution-based chemical method. Surface morphology characterization and chemical state analysis were combined to indicate that the Au nanoparticles (NPs) were well contacted with ZnSnO3 cubes to form the Schottky barrier–type junctions from characterization results. Based on the chemical catalysis and the Schottky barrier, the sensor based on Au-ZnSnO3 cubes demonstrated excellent response (94.3 to 100 ppm) and better selectivity to ammonia gas at low temperature (80 °C) with the fast response/recovery time of 8/5 s. Meanwhile, the sensor exhibited good repeatability stability and high selectivity towards ammonia among other test gases. The sensing mechanism was proposed in terms of the combination of ZnSnO3 cube structure and catalytic activity of Au nanoparticles loaded. This work provides an efficient strategy for the fabrication of NH3 sensors at low temperature. [ABSTRACT FROM AUTHOR]

CsPbX3 (X = Cl-, Br-, I-) pervoskite single crystals have excellent photoelectric properties, and are promising to become the next generation of photoelectric detection materials. It is difficult to grow CsPbCl3 crystals by low-temperature solution method due to the solubility of CsCl in the precursor is too small. Here, 1 inch complete CsPbCl3 crystals were grown by Bridgman method, a series of processing was performed on the crystals to obtain single crystal sheets of Φ10 mm x 10 mm and 2 mm thickness. X-ray powder diffraction patterns, TG/ DTA curves, X-ray excitation emission spectra, transmission spectra and low temperature fluorescence spectra of the crystals were measured. Under X-ray excitation, two X-ray excitation peaks are observed at 430 and 575 nm, and the transmittance of the crystal reaches 75%; thermal quenching could be observed by the photoluminescence (PL) intensity versus temperature dependence curve, and the exciton binding energies of the four peaks of the crystal are calculated to be 12. 59, 8. 21, 12. 41 and 21. 59 meV, respectively. [ABSTRACT FROM AUTHOR]