NO2 and Humidity Sensing Characteristics of Few-layer Graphene

TL;DR

This study investigates the sensing capabilities of various few-layer graphene samples for detecting NO2 and humidity, highlighting the influence of preparation methods and doping on sensitivity.

Contribution

It introduces a comparative analysis of different graphene types and modifications for gas sensing, revealing how preparation and doping affect sensitivity.

Findings

DG shows highest NO2 sensitivity.

Nitrogen-doped HG enhances NO2 sensitivity.

HG exhibits highest humidity sensitivity.

Abstract

Sensing characteristics of few-layer graphenes for NO2 and humidity have been investigated with graphene samples prepared by the thermal exfoliation of graphitic oxide (EG), conversion of nanodiamond (DG) and arc-discharge of graphite in hydrogen (HG). The sensitivity for NO2 is found to be highest with DG. Nitrogen-doped HG (n-type) shows increased sensitivity for NO2 compared to pure HG. The highest sensitivity for humidity is observed with HG. The sensing characteristics of graphene have been examined for different aliphatic alcohols and the sensitivity is found to vary with the chain length and branching.