In the world of 2D materials research, a revolution is brewing, and it's not just about the groundbreaking properties of graphene and its peers. The real game-changer lies in the efforts to bridge the reproducibility gap, a chasm that has long plagued this field. This is a story of experts striving to bring order to chaos, to ensure that the incredible potential of these materials can be fully realized and translated into practical applications.
The Promise and the Pitfalls of 2D Materials
Graphene, that remarkable atom-thin sheet of carbon, has been the poster child for 2D materials since its debut in 2004. Its strength, electrical conductivity, and other extraordinary properties have sparked a wave of innovation, leading to the discovery of other 2D materials like hexagonal boron nitride and molybdenum disulfide. These materials hold the promise of revolutionizing electronics and other technologies.
However, working with these materials is akin to taming a wild beast. Even the slightest variation in lab conditions can dramatically alter their properties. Researchers often find that replicating the results of another lab is an impossible task, a phenomenon known as the "reproducibility gap." This gap is a major roadblock, slowing down the process of technology transfer and hindering the practical applications of these materials.
Closing the Gap: A Collaborative Effort
Enter Peter Bøggild, a researcher at the Technical University of Denmark, who has brought together a diverse group of stakeholders, including academics, industry experts, and funding bodies. Their mission? To develop practical guidelines that can help close this reproducibility gap.
The expert group proposed a template called the Standardized Template for Experimental Procedures (STEP). This template goes beyond the usual methods section of academic papers, encouraging researchers to provide far more detail about their experimental conditions, including the trials and tribulations of working with 2D materials. The idea is to capture the tacit knowledge that researchers often share verbally but rarely commit to paper.
Ediz Herkert, a postdoc researcher at the Institute of Photonic Sciences in Barcelona, believes that these guidelines could be a game-changer. He envisions it as having an experienced postdoc by your side, guiding you step by step through the process.
The Impact on Technology Transfer
Amaia Zurutuza, the scientific director at Graphenea, a company that manufactures graphene-based materials and chips, highlights the importance of reproducibility for technology transfer. She emphasizes that these materials are already complicated, and without reproducibility, the challenges multiply.
The susceptibility of 2D materials to contamination is a major concern. Every atom is exposed to the outside world, making them vulnerable to any impurities that might land on them. As Bøggild puts it, "The materials are literally from another dimension." Subtle differences in preparation and handling methods can have a huge impact on their properties.
Furthermore, the reporting of results is often biased, with researchers focusing on the "hero device" that performs exceptionally well, while ignoring the numerous failures that led to that success. This lack of transparency makes it difficult for industry to replicate and scale up these methods.
The STEP Protocol: A Recipe for Success
The STEP protocol aims to address these issues by providing a comprehensive guide to experimental procedures. It encourages researchers to break down their methods into small, detailed steps, covering everything from materials and equipment to variations in conditions like pressure and temperature. It also includes troubleshooting guidance and a list of common problems encountered, along with solutions.
Herkert and his colleague, Jaime Díez Mérida, are already implementing the STEP method at ICFO and have started adding their own procedures to a shared database. They believe that while creating a STEP protocol is time-consuming, it has immediate benefits for the researchers themselves, as it forces them to focus on the critical elements of their method and potentially reveals areas for improvement.
The Reproducibility Charter: A Checklist for Success
In addition to STEP, Bøggild and his coauthors propose the Reproducibility Charter (ReChart), a checklist that can be used by funders and publishers to promote reproducibility goals. For instance, funders could allocate part of a grant specifically for creating STEP protocols, while publishers could adopt ReChart to establish requirements for reproducibility reporting in papers.
Anders Smith, a funding manager at the Villum Foundation, supports this approach. He believes that by encouraging researchers to focus on reproducibility, they can create interesting new work by examining accepted results that might have been overlooked before.
The Way Forward
While major graphene projects like the European Union's Graphene Flagship program already have reproducibility goals, the key challenge lies in persuading a critical mass of 2D materials stakeholders to adopt these recommendations. Bøggild believes that a small shift, a "little push" from him and others, could make a significant difference.
Herkert agrees, highlighting the broader impact of such a rigorous focus on reproducibility. He believes that the STEP protocol is not limited to the field of 2D materials but can be useful in many different fields, especially those related to nanofabrication and clean room work.
In conclusion, the efforts to close the reproducibility gap in 2D materials research are not just about improving scientific practices. They are about unlocking the full potential of these materials, ensuring that their incredible properties can be harnessed for practical applications, and ultimately, driving innovation and progress in various industries.
