|제목||Reading between the yarn: learning how platinum can help weave wearable electronics|
|summary||Scientists study the surface chemical reactions involved in depositing platinum on the surfaces of v|
|prof.||신소재공학과 이한보람 교수님|
Reading between the yarn: learning how platinum can help weave wearable electronics
Scientists study the surface chemical reactions involved in depositing platinum on the surfaces of various fabrics at low temperatures
In a recent study, scientists from Korea and USA shed new light on the surface chemical reactions involved in depositing a layer of platinum atoms on various textiles. In doing so, they have illuminated a path to developing better and more effective techniques of fabricating electronic textiles for wearable devices and in other applications.
To create cloth that conducts electricity, platinum layers were deposited on the macrofibrils of different textiles (cotton, silk, nylon, wool, Kevlar, and Nomex) using a technique called atomic layer deposition. This technique worked for all fabrics except nylon.
(Photo courtesy: Shutterstock)
As the 21st century matures, the demand for flexible and wearable devices grows. The quest for ways to fulfill this demand led scientists down the path to finding techniques for integrating electronic elements—such as sensors, antennas, and transistors—into textiles. Along this path, it soon became evident that for such integration to be successful, wearable textiles must be converted into conducting materials.
Several techniques to achieve this were proposed, from incorporating metal wires into textiles to using unconventional conductive materials such as conductive polymers. Among these, a promising technique emerged: coating textile fibers with nanoscale metallic films. It was found that this technique preserves the flexibility of the textile while adding the conductivity of the metal.
The most effective method to carry out the coating process is called atomic layer deposition (ALD), which allows thickness control at the atomic scale and results in high-purity films with excellent conformality and uniformity. But a major roadblock to successfully carrying out ALD is the development of metal-containing compounds that can react sufficiently well with the surfaces of textiles.
In a recent study, a team of scientists, led by Prof Han-Bo-Ram Lee from Incheon National University, Korea, developed a new platinum-containing compound that overcame this reactivity challenge and enabled direct ALD of platinum on cotton fibers. They then set out to investigate the underlying surface chemical reactions, using several commercial textiles: cotton, silk, nylon, wool, Kevlar, and Nomex.
Via quantum chemical calculations, and observations of the structural and chemical changes on the microfibrils of the textile, they learned how the platinum grew on the textile surface. They saw that platinum deposited well on all fabrics except nylon. They also discovered that the reaction by which platinum coated each fabric was unique.
To see if their conductive textiles were any good, they fabricated a device called the resistive heater, and tested its function and durability. The device proved to have good heating performance, low wear-and-tear rate, high bending stability, and a long lifetime. In other words, their ALD method was practically applicable.
The studies by Prof Lee and team have successfully removed a roadblock on the avenue leading to large-scale commercial wearable electronic devices, and opened up new possibilities. “We may extend the ideas in this work to improve conductive textile fabrication and enable other wearable device applications using these textiles,”Prof Lee explains. With these findings, research has taken one significant step forward. As Prof Lee says, “these results pave the way to enabling the integration of current electronic systems, based on rigid substrates, into flexible systems and devices.”
Il-Kwon Oh1, Jong Seo Park2,3, Mohammad Rizwan Khan4, Kangsik Kim5, Zonghoon Lee5, Bonggeun Shong6, and Han-Bo-Ram Lee*,4
Title of original paper:
Reaction Mechanism of Pt Atomic Layer Deposition on Various Textile Surfaces
ACS Chemistry of Materials
1Department of Chemical Engineering, Stanford University
2School of Electrical and Electronic Engineering, Yonsei University
3Research Institute of Engineering Technology, Incheon National University
4Department of Materials Science and Engineering, Incheon National University
5School of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST)
6Department of Chemical Engineering, Hongik University
*Corresponding author’s email: email@example.com
About Incheon National University
Incheon National University (INU) is a comprehensive, student-focused university. It was founded in 1979 and given university status in 1988. One of the largest universities in South Korea, it houses nearly 14,000 students and 500 faculty members. In 2010, INU merged with Incheon City College to expand capacity and open more curricula. With its commitment to academic excellence and an unrelenting devotion to innovative research, INU offers its students real-world internship experiences. INU not only focuses on studying and learning but also strives to provide a supportive environment for students to follow their passion, grow, and, as their slogan says, be INspired.
About the author
Prof Han-Bo-Ram Lee is an Associate Professor of the Department of Materials Science and Engineering at Incheon National University. In the last 14 years, he has dedicated his research efforts to understanding surface chemical reactions and interactions at the nanoscale range. His main research fields are atomic layer deposition, thin films, hydrophobics, surface science, and electronic textiles. In recognition of his outstanding research performance as an early career researcher, he was appointed Associate Editor of the Chemistry of Materials journal, of the American Chemical Society—one of the world’s most prestigious journals in the field of materials chemistry research—in 2018.