Non-Enzymatic H <sub>2</sub> O <sub>2</sub> Sensor Using Liquid Phase High-Pressure Exfoliated Graphene
Ramu Banavath, Siva Sankar Nemala, Rohit Srivastava, Parag Bhargava
Abstract
Importance of graphene-based nanomaterials in electrochemical sensors has increased due to their exceptional electrochemical properties and electrocatalytic activity. Despite the significant amount of work on graphene exfoliation, there is a need for large-scale, environmental friendly production of high-quality graphene for electrochemical sensing applications. This work describes the use of liquid phase mechanical (high-pressure) exfoliation for synthesis of graphene and its application in H 2 O 2 electrochemical sensors. The basic electrochemical characterizations of exfoliated graphene samples have shown great enhancement in electrochemical activity due to their improved ion adsorption ability as a result of increased electroactive surface area and the presence of functional groups (defective sites). The developed H 2 O 2 sensors showed excellent sensitivity and limit of detection (LOD). The repeatability, reproducibility, and stability studies of liquid phase mechanical exfoliated graphene-based H 2 O 2 sensors showed consistent results suggesting the potential usage of the exfoliated graphene in electrochemical sensors. The interference study of fabricated sensors revealed the selective H 2 O 2 sensing nature of exfoliated graphene and confirmed its potential for H 2 O 2 determination in real samples.