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Efficient and stable photocatalyst is the pursuit in the field of photocatalysis. Recently, CsPbX3 (X = Cl, Br, I) perovskite nanocrystals (NCs) leave a deep impression due to their photocatalytic properties. Nevertheless, direct applications in water splitting reactions have been confined because of their poor stability in the polarity solution. In this work, we designed a robust borosilicate glass host, and CsPbCl1.5Br1.5: xZn2+ (x = 0, 0.25, 0.35, 0.5) NCs were crystallized in the glass via a strategy of in situ crystallization. Furthermore, we focused on the regulation of photocatalyst achieved by Zn2+ ions doping, then adopted two different methods for the first time to realize the external modification of glass powder and explore their effects on photocatalytic water splitting towards H2 production. When the doping amount of Zn2+ ions was 0.25 and the powder was prepared by mechanical ball grinding modification, the optimal H2 production performance can reach to 290.67 μmol g−1. In addition, compared with perovskite NCs colloid, the powder with preferable water stability will have a great potential in water splitting reactions.

Silver indium sulfide (AIS) quantum dots (QDs) with different Ag/In molar ratios were synthesized via a hot-injection method. Intense photoluminescence (PL) originating from the donor–acceptor pair recombination were observed for all the samples and the emission peak blue-shifted from 739 to 632 nm, being similar to the behavior of the absorption onset as the Ag/In ratios decreased. The highest PL quantum yield (QY) of the obtained ternary AIS QDs was ca. 62% with an optimum ratio of Ag/In = 1/4. Compared with AIS QDs, when Zn ions were introduced, the absorption spectra of the obtained quaternary Ag–Zn–In–S QDs were blue-shifted, and their emission peaks moved to higher energies accordingly, showing a tunable emission from red to green by altering the band gap energy. In order to further study the electroluminescence (EL) as well as looking forward to the applications in the optoelectronic devices of the obtained highly luminescent nanoparticles, the colloidal AIS QDs were deposited as thin films to the sandwich-like structured QD-LED. The experimental results showed that the obtained EL device exhibited EL emission originated from QDs thin films by adjusting the turn on voltage, which is for the first time to realize EL of AIS QDs in such QD-LED.

A simple solvothermal route has been successfully used to prepare Cu2ZnSnS4 nanocrystals using metal chloride and L-cysteine as precursors at 180 °C for 16 h. L-cysteine was used as the sulfide source and complexing agent. The phase, structure, morphology, and optical properties of the as- synthesized products were characterized by powder X-ray diffraction (XRD), field-emission scan electron microscopy (FESEM), energy dispersive spectrometry (EDS), high-resolution electron transmission microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), and ultraviolet-visible (UV-Vis) spectrophotometer. The results showed that pure kesterite-type Cu2ZnSnS4 nanocrystals were prepared under this condition and the diameters of the microspheres were about 400-800 nm while the microspheres consisted of nanoflakes with thickness of 20 nm. The band gap of CZTS nanoparticles was about 1.58 eV,which was close to the optimum band gap of thin film solar cells. A possible formation mechanism was also discussed.

A simple L-cystine-assisted synthetic route has been successfully developed to prepare Cu 3 SbS 3 nanorods under solvothermal conditions. In this synthetic system, we used CuCl 2 as the copper source, SbCl 3 as the antimony source, and L-cystine as both sulfur source and complexing reagent. The obtained Cu 3 SbS 3 nanorods were characterized by XRD, XPS, FESEM and TEM (HRTEM). The results showed that the Cu 3 SbS 3 nanorods were 100–150 nm in width and several micrometers in length. A possible formation mechanism for Cu 3 SbS 3 nanorods was also discussed. The proposed solvothermal method using L-cystine as the sulfur source provides an alternative approach to prepare other ternary semiconductor nanomaterials.

l -Cystine was successfully used as a novel kind of sulfur source to grow Sb 2 S 3 nanoribbons at 180 °C for 24 h in a mixed solution made of ethylene glycol and distilled water. The nanoribbons were usually tens of micronmeters in length, typically 100–300 nm in width. The structure of the nanoribbons was determined to be of the orthorhombic phase. A reasonable possible mechanism for the growth of Sb 2 S 3 nanoribbon structures has been proposed. The as-obtained Sb 2 S 3 products were examined using diverse techniques including X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), selected-area electron diffraction, and high-resolution TEM.

Monoclinic-FeOOH with: a = 0.9981 nm, b = 0.2948 nm, n = 1.0485 nm, β = 92.26° was synthesized by the hydrolysis of FeCl3 · 6H2O in micro emulsion including NP-4, octane, water. In this paper, the various morphology and size of the nano particles under different conditions are discussed, and it is found that the optimum conditions for synthesizing acicular β-FeOOH is that R = 6.0, [Fe3+] = 0.02 mol/L within the pH range 1.6–2.0.

L-cystine is successfully used as a kind of sulfur source to grow CuInS2 nanocrystallines at 200° C for 18 h in a mixed solution made of 20 mL ethylenediamine and 20 mL distilled water. The diameter of the CuInS2 nanocrystallines ranges from 300 to 500 nm. The structure of nanocrystallines is determined to be of the tetragonal phase of CuInS2. A reasonable possible mechanism for the growth of CuInS2 nanocrystallines is proposed. The as-obtained CuInS2 products are examined using diverse techniques including x-ray powder diffraction, x-ray photoelectron spectroscopy, field-emission scanning electron microscopy, transmission electron microscopy, selected-area electron diffraction and high-resolution transmission electron microscopy.