NanoTechnology: Materials, Processes & Devices

Bulk gamma-InSe has a direct bandgap of 1.24 eV, which corresponds to near infrared (NIR) wavelengths (λ = 1.0 µm) useful in optoelectronic applications from biometric detectors to silicon photonics. However, its potential for optoelectronic applications is largely untapped due in part to the lack of quantitative studies of its optical properties. Here, we study the unusually low absorptance and high photoluminescence quantum efficiency of single-crystalline InSe flakes with thickness in the hundreds of nanometers. InSe emits brightly at room temperature from its direct bandgap with a peak...

Atomically dispersed metal catalysts have garnered considerable attention due to their unique properties and superior catalytic activity. The isolation of metal atoms on the matrix offers enhanced catalytic performance even with a small content of noble metal loading. This class of materials provides exciting opportunities to improve the performance of chemical and biochemical sensors. In this work, we have selected Pd as the catalysts because of its high catalytic activity and graphene oxide as the matrix because of its high electrical conductivity and unique electrochemical properties....

Long-term stability of chemiresistive gas sensors is essential for their use in industrial and residential safety and air-quality monitoring systems. Incorporation of noble metals into the gas sensors has been proved to be an effective strategy to enhance their sensitivity and selectivity. However, noble metal particles are prone to poisoning, resulting in catalyst deactivation. Atomically dispersed supported metal catalysts constitute a new class of materials that contains isolated individual atoms or synergistically coupled few-atom ensembles dispersed on, and/or coordinated with...