Researchers from several institutions. including the University of Nottingham, University of Warwick and Diamond Light Source, have developed a novel approach to controlling structural defects in graphene, enhancing its functionality for a range of technological applications.
Using a one-step chemical vapor deposition process, the scientists have grown graphene films from azupyrene - a molecule designed to mimic the defects known as Stone-Wales defects, which consist of adjacent five- and seven-membered carbon rings instead of graphene’s typical six-membered arrangement. By adjusting the growth temperature on a copper substrate, the concentration of these defects can be precisely controlled: higher temperatures yield graphene closer to its ideal, defect-free lattice, while lower temperatures facilitate the intentional inclusion of defects.
This controlled defect engineering is significant because pristine graphene, while exceptionally strong and conductive, can be too inert for certain electronic applications, as it interacts weakly with other materials and lacks some desired electronic properties. The introduced defects enhance graphene’s ability to interact with other materials, improving its performance as a catalyst and increasing its sensitivity for sensor applications. Furthermore, these defects can modify graphene’s electronic and magnetic properties, broadening its potential use in semiconductors and nanoelectronic devices.
The researchers confirmed that the defective graphene can be transferred onto different substrates without losing its engineered properties, an essential step for integrating this material into practical devices.
This project brought together scientists from multiple institutions across the UK, Germany, and Sweden, and employed advanced microscopy, spectroscopy, and computational modeling to visualize and understand how defects alter graphene’s atomic structure and properties. As a result, this work provides a pathway for the purposeful design of graphene films with tailored properties for applications in nanoelectronics, sensors, batteries, and catalysis.
