Abstract: The present disclosure relates to the use of black phosphorus nanoflakes in humidity sensing and transistor applications. More particularly, the present disclosure relates to humidity sensing devices comprising black phosphorus nanoflakes, to methods for sensing humidity with such devices, to transistors comprising black phosphorus nanoflakes, and to methods for switching the gate of such transistors. In one aspect, the disclosure provides a device for sensing moisture, the device including a substrate; and a surface including at least one atomic layer of black phosphorus nanoflakes disposed on the substrate, wherein the sensing device is specific to sensing humidity, exhibiting a selective response against water vapor.

Abstract: the present disclosure relates to photoelectrochemical cells and methods for using such for reduction of carbon dioxide and oxidation of water. In one aspect, the disclosure provides a method of electrochemically reducing carbon dioxide in an electrochemical cell, comprising contacting the carbon dioxide with at least one transition metal dichalcogenide in the electrochemical cell and at least one helper catalyst and applying a potential to the electrochemical cell.