A set of Co x Pt100−x nanoparticles (NPs) was synthesized by the sol–gel method. The structure and magnetic properties of the produced samples were investigated by x-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED) and a vibrating sample magnetometer. When the Co content ranged from 25 to 75 at%, the results of XRD, HRTEM and SAED revealed the formation of L12 CoPt3, L10 CoPt and face-centred cubic Co3Pt NPs. Magnetic measurements indicated that CoPt3 and Co3Pt had soft magnetic properties. When the Co composition was 50 at%, the sample coercivity reached a giant value of ∼470 kA m−1.

In this study, we designed shell-dependent Ag@Cu2O core–shell nanoparticles (NPs) for SERS study. Compared to Cu2O NPs, Ag@Cu2O core–shell NPs exhibited high SERS activity because of the localized surface plasmon resonance (LSPR) from Ag core.

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Herein, we successfully prepared dithiocarbamate-based Cu2ZnSnS4 (CZTS) precursor solutions using various amino groups such as methylamine, ethylamine, propylamine, butylamine, amylamine, hexylamine, octylamine, and ethanolamine.

Ag2ZnSnSe4 (AZTSe) thin films were synthesized using a simple solution approach combined with a post-selenization technique. A single phase of the AZTSe film with kesterite structure and high crystal quality was obtained at the optimized selenization temperature and time. The AZTSe film showed an optical bandgap of 1.4 eV, an n-type conduction with an electron concentration of 5.7 × 1015 cm−3, and a mobility of 9.1 cm2 V−1 s−1. An optimized n-type AZTSe film was fabricated on a p-GaN/sapphire to form an n-AZTSe/p-GaN heterojunction. The current–voltage measurement of the n-AZTSe/p-GaN heterojunction photodetector showed good rectification characteristics. The response wavelength of the photodetector covered a wide range from ultraviolet to infrared (370–960 nm). The response peak was located at 810 nm with a responsivity of 2.9 × 10−4 A/W.