The synthesis of polyacetylene thin films, a development that transformed the understanding of materials science, emerged from laboratory work conducted in Japan during the 1970s. This breakthrough allowed researchers to observe metallic properties in organic polymers, a phenomenon that eventually earned its discoverers the 2000 Nobel Prize in Chemistry and fundamentally shifted the study of electrical conductivity in synthetic substances.
Early Education and Career Beginnings
Born in Tokyo on August 20, 1936, Hideki Shirakawa pursued an academic path in chemical engineering. He completed his undergraduate degree at the Tokyo Institute of Technology in 1961, later earning his doctorate at the same institution in 1966. Following his graduation, he joined the Chemical Resources Laboratory at Tokyo Tech as an assistant. During this period, his initial experiments with polyacetylene led to the creation of thin films, a material that exhibited an unexpected metallic appearance.
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In 1975, Alan MacDiarmid visited the Tokyo Institute of Technology and observed the polyacetylene films produced in the laboratory. This interaction resulted in an invitation for Shirakawa to join MacDiarmid’s research group at the University of Pennsylvania as a post-doctoral fellow in 1976. Working alongside MacDiarmid and physicist Alan Heeger, Shirakawa explored the electrical properties of the material. In 1977, the team discovered that doping polyacetylene with iodine vapor significantly enhanced its electrical conductivity, confirming its potential as a conductive polymer.
Professional Tenure and Academic Leadership
Shirakawa transitioned to the University of Tsukuba in 1979, beginning as an assistant professor before advancing to a full professorship three years later. His administrative contributions included serving as the chief of the Science and Engineering Department of the Graduate School and managing the university's Category #3 group until 1997. His research agenda at Tsukuba expanded to include the creation of conjugated liquid crystalline polymers and the development of acetylene polymerization techniques utilizing liquid crystals as solvents.
Scientific Recognition and Advocacy
The discovery of conductive polymers led to the 2000 Nobel Prize in Chemistry, shared with MacDiarmid and Heeger. That same year, the Japanese government granted Shirakawa the Order of Culture and designated him a Person of Cultural Merit. Beyond his laboratory research, Shirakawa engaged in public policy discussions. In 2013, he joined fellow Nobel laureate Toshihide Maskawa to publicly oppose Japan’s State Secrecy Law, arguing that the legislation threatened academic freedom and fundamental constitutional rights.
Fast facts
- Born: August 20, 1936, Tokyo, Japan
- Died: August 24, 2026, Yokohama, Japan
- Education: Tokyo Institute of Technology, University of Pennsylvania
- Key Discovery: Conductive polyacetylene thin films
- Nobel Prize in Chemistry: 2000
- Academic Affiliations: University of Tsukuba, Zhejiang University
- Membership: Japan Academy
- Major Awards: Order of Culture (2000)
Questions readers ask
What is the primary significance of polyacetylene in chemistry?
Polyacetylene is a polymer that, when doped with substances like iodine, exhibits metallic conductivity, bridging the gap between plastic-like materials and conductive metals.
Did Hideki Shirakawa hold emeritus status at any institutions?
Yes, he was a Professor Emeritus at both the University of Tsukuba and Zhejiang University.
Achievements
- Nobel Prize in Chemistry — 2000
- Educated at Tokyo Institute of Technology and University of Pennsylvania
- Worked as chemist, engineer and professor
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