Luis Royo Romero
High Point University
NIST Research Intern
National Institute of Standards and Technology (NIST)
Developing New Characterization Techniques
Luis is working with the CMOS and Novel Devices Group, Engineering Physics Division, Physical Measurement Laboratory at the National Institute for Standards and Technology (NIST). The CMOS and Novel Devices Group develops new characterization techniques, physics-based models, and data analysis methods to accelerate the commercialization and manufacture of high performance and reliable electron devices for the electronics industry. The Group develops the advanced metrology tools to enable quantitative and mechanistic assessment of reliability issues in emerging electronic devices. Another key thrust is to develop new measurements, physical models, and data analysis techniques to accelerate the development and commercialization of nanoelectronic device-based medical technology for life sciences and personalized health care.
Single-wall carbon nanotubes (SWCNTs) possess unique optical and electronic properties due to their strictly one-dimensional nature and large aspect ratio, that can be enhanced at the macroscopic scale when the SWCNTs are well-aligned. Specifically, the low thermal interface resistance, highly polarized absorption and photoluminescence, and mechanical and transport properties show vast enhancement when the tubes are aligned. Engineering of a large-scale (mm2) architecture of aligned SWCNTs has challenged the community for years and presents a major drawback in their use in many applications. In addition, the reproduction of reported results in the CNT field remains a challenge due to insufficient methodical details and a lack of understanding of the role of certain experimental parameters. Recently, the first demonstration of high-quality aligned films of SWCNTs with 1.4 nm tube diameter was reported by X. He et al. The goal of our work is to refine and optimize their reported method and establish the robust capability to produce aligned macroscopic films at NIST using tubes of varying chiralities and surfactants. Creating monodomain, aligned films utilizes the technique of slow vacuum filtration, yet is complex due to tube sensitivities to electrostatics as well as other currently unquantified variables. Optimization of the method and development of a rigid protocol involves varying several parameters, including SWCNT concentration, surfactant concentration, and filtration flow rate. Once multiple films are produced, they need to be transferred from the polycarbonate nanopore membrane used during filtration onto other substrates for device fabrication and characterization, including polarized optical microscopy, Raman spectroscopy, and absorption. The status of the project will be presented and discussed.
I am a recent graduate of High Point University with a Bachelor's of Science in Physics and in Mathematics. In my time at the university, I conducted independent research in the chemistry and the physics departments. I also played on the ultimate frisbee club team and was an active member of High Point’s Society of Physics chapter and multiple other clubs around campus. I volunteer in many outreach events and have worked at a summer camp with kids of all ages. I have a strong interest in teaching that I want to continue pursuing as well. I plan to attend graduate school for physics to conduct material science research and become a professor at a university.
I am originally from Bogota, Colombia. I went to Carrboro High School in North Carolina where I played soccer, tennis and ultimate. I am currently an ultimate player for the Turbine Club team and a practice player for the Raleigh Flyers Professional Team. In my free time, I like to explore different cuisines and to create my own dishes at home. I enjoy traveling, outdoor adventures, photography, art, and spoken word. I am looking forward to the opportunity to work at NIST alongside people who share the same passion and to explore D.C.