Recent advancements and applications of solar-blind ultraviolet photodetectors utilizing Ga₂O₃ and AlGaN materials.

The modified morphology and the extra pseudocapacitive contribution from RE₂O₃ particles lead to enhanced capacitive performance of polyindole.

We demonstrate a highly selective and reversible NO ₂ resistive gas sensor using vertically aligned MoS ₂ (VA-MoS ₂ ) flake networks. We synthesized horizontally and vertically aligned MoS ₂ flakes on SiO ₂ /Si substrate using a kinetically controlled rapid growth CVD process. Uniformly interconnected MoS ₂ flakes and their orientation were confirmed by scanning electron microscopy, x-ray diffraction, Raman spectroscopy and x-ray photoelectron spectroscopy. The VA-MoS ₂ gas sensor showed two times higher response to NO ₂ compared to horizontally aligned MoS ₂ at room temperature. Moreover, the sensors exhibited a dramatically improved complete recovery upon NO ₂ exposure at its low optimum operating temperatures (100 °C). In addition, the sensing performance of the sensors was investigated with exposure to various gases such as NH ₃ , CO ₂ , H ₂ , CH ₄ and H ₂ S. It was observed that high response to gas directly correlates with the strong interaction of gas molecules on edge sites of the VA-MoS ₂ . The VA-MoS ₂ gas sensor exhibited high response with good reversibility and selectivity towards NO ₂ as a result of the high aspect ratio as well as high adsorption energy on exposed edge sites.