The Department of Materials Science and Engineering welcomes Professor Jagdish Narayan of North Carolina State University as part of the MSE Seminar Series. His presentation was titled “Discoveries of Q-carbon and Q-BN and Direct Conversion of Carbon into Diamond and h-BN into c-BN.” Below is the abstract:
Throughout human history, materials have played a critical role in advancing technologies which have benefitted the society. From the Stone Age to Bronze Age to Iron Age to Semiconductors and Nanomaterials, materials through their properties have played a critical role in improving the quality of human life and taking us to the next level. The recent discovery of Q-Materials may take us to a higher level yet in view of their unprecedented superior properties. Discoveries related to Q-carbon and Q-BN, and direct conversion of carbon into diamond and h-BN into c-BN at ambient temperature and pressure illustrate the power of nonequilibrium activation and processing. Among its many unique and unprecedented properties, Q-carbon is harder (as much as 70%) than diamond, it is ferromagnetic and electrochromic in pure form and it can be made superconducting upon doping with boron with transition temperature over 57K (highest for BCS superconductors). This record superconducting temperature is expected to go still higher with increasing B-concentration in Q-carbon. Carbon can be also converted into a diamond in the form of single-crystal nanodots (NV nanodiamons), microdots, nanoneedles, microneedles, and large-area single-crystal films, which can be doped with both n- and p-type dopants. Doping of diamond with concentrations far higher than solubility limits is made possible only by nonequilibrium laser processing via solute trapping. This breakthrough stands to revolutionize next-generation atomic sensing, quantum computing, and quantum communication, in addition to high-power, high-frequency, high-temperature, and radiation-resistant devices for a variety of applications. To realize the full potential of these Q-carbon and diamond-related materials and structures, they need to be integrated on practical substrates through the paradigm of domain matching epitaxy to achieve much-needed functionalities in novel solid-state devices. All these aspects will be covered in this colloquium. Biography: Jagdish (Jay) Narayan is The John Fan Family Distinguished Chair Professor in the Department of Materials Science and Engineering at North Carolina State University. He obtained his MS (1970) and PhD (1971) from UC Berkeley in a record time of two years, after B. Tech (Distinction and Highest Honors) in 1969 from IIT, Kanpur. Narayan is internationally known for his groundbreaking contributions in laser-solid interactions and nonequilibrium processing of novel materials, defects, and interfaces in solids, domain epitaxy for thin film epitaxy across the misfit scale in thin film heterostructures, and integration of new materials and their functionalities for novel devices. Narayan played a critical role in the launch of Materials Research Society, where two symposia (Defects in Semiconductors, and Laser -Sold Interactions and Transient Thermal Processing of Materials) organized initially by Narayan were repeated in the early formative years. His recent discoveries of direct conversion of carbon into Q-carbon and diamond and h-BN into Q-BN and diamond are quite intimately linked to his early pioneering work in Si, Ge and GaAs. Narayan has graduated highly successful 77 PhDs and published over 500 papers in archival journals and received 40 patents with h-index >81 and Google Citations 29,000. He is Lifer Member and Fellow of three Academies (NAE, NAI, NAS) and seven professional societies (MRS, TMS, APS, AAAS, ASM, MRS-I, BPG). He is the recipient of many awards, including a trio of ASM Gold Medal, Acta Materialia Gold Medal, and TMS RF Mehl Gold Medal. The Materials Science and Engineering Distinguished Seminar Series is partially supported by the UCF College of Graduate Studies (CGS).