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Due to the advantages of narrow energy distribution of plasmonic hot-electrons in Ag and the high density of states in the TiO2 conduction band, an Ag/TiO2 composite is considered to be an ideal combination to construct a plasmonic hot-electron photodetector with high detectivity and a high response speed. In this work, we fabricate a porous Ag/TiO2-Schottky-diode based plasmonic hot-electron photodetector. This detector shows a high detectivity of 9.8 × 1010 cmHz1/2/W and a fast response speed, with a rise and fall time of 112 μs and 24 μs, respectively, under 450 nm light illumination at zero bias voltage. In addition, the height of the Ag/TiO2 Schottky barrier can be decreased by removing the chemisorbed oxygen from the surface of TiO2 with ultraviolet light illumination, and as a result, the responsivity of the Ag/TiO2 plasmonic hot-electron photodetector at 450 nm can increase from 3.4 mA/W to 7.4 mA/W.

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An alternative route was proposed for preparing rutile titanium dioxide (TiO 2 ) white pigment. The process involves the digestion of titanium slag with sulfuric acid, subsequent hydrolysis of unenriched titanyl sulfate solution with ammonia, low-temperature calcination, and unseeded crystallization, producing a high-quality rutile TiO 2 white pigment. The experimental data indicated that the conversion ratio of dissolved Ti in the unenriched titanyl sulfate solution was highly dependent on the NH 3 /TiO 2 molar ratio. Under the optimal conditions, approximately 92.0% of dissolved Ti in the solution could be converted to metatitanic acid (H 2 TiO 3 ) that was then calcined at 850 °C to form rutile TiO 2 pigment with purity of 98.41% and mean particle diameter of 0.1−0.3 μm. The presence of NH 4 + during the hydrolysis improved the stability of the charged H 2 TiO 3 particles and blocked further coagulation. The fast phase transformation at relatively low temperature could be attributed to the presence of self-generated rutile nuclei. In addition, the experimental validation for the unseeded precipitation of ferrous ammonia sulfate ((NH 4 ) 2 Fe(SO 4 ) 2 •6H 2 O) in the crystallization step was demonstrated.

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Crooked Ag2Te nanotubes were prepared through homogeneous precipitation and the photoelectric properties of the film-based photodetector were investigated.

Eu3+-doped Ba3In(PO4)3 was synthesized through a high-temperature solid-phase method. According to the structure refinement based on X-ray diffraction and density functional theory, the crystal and energy band structure of Ba3In(1-x)(PO4)3:...

Tellurium nanowires (NWs) are attractive one-dimensional materials for many applications, yet most synthesis processes require hazardous chemical reducing agents and extreme operating conditions. Here we described a solvothermal synthesis of Te NWs using a non-toxic reducing agent, ascorbic acid. Then the Te NWs were assembled into a well-aligned film through a stirring-assisted oil-water-air interface assembly method and a Te NWs photodetector was fabricated which is sensitive to infrared radiation. The photodetector based on the well-aligned Te NWs film had a series of more excellent photoelectric properties than that based on those being randomly oriented. For example, the photoresponsivity of the former is 10 times larger, and the response time is 1.15 × 10 times shorter, than those of the latter.