Photo by Candace diCarlo
Success, the old saw goes, has many fathers. Alan MacDiarmid has been careful to acknowledge all of them whenever he talks about his latest achievement.
And since winning the 2000 Nobel Prize in Chemistry Oct. 11, MacDiarmid, the Blanchard Professor of Chemistry, has praised them all many times over: at a same-day press conference for the local media, at receptions in his honor thrown by his department and by President Judith Rodin, in numerous interviews, including this one with the Current.
And still the reporters come, asking how it came to pass that MacDiarmid, Alan Heeger and Hideki Shirakawa, working at Penn in the late 1970s, discovered that with a little tweaking, they could make plastic conduct electricity.
That discovery ultimately led to the first homegrown Nobel in the sciences for Penn.All of the basic research that led to the discovery of conducting polymers took place in Penn labs including the one right down the hall from MacDiarmids office, which the local section of the American Chemical Society named a historic site earlier this year. Heeger was a Penn physics professor at the time.
Since we figure youve already heard about the history of MacDiarmids research in one of the many stories that have appeared in the wake of the Nobel, well just give you the quick summary here. The man loves pretty colors, and one day in the early 1970s, Heeger asked him to look at an inorganic polymer that produced lovely golden crystals and films. It proved to be a superconductor, the first non-metallic one. He later spoke about this work in Japan, where Shirakawa, then a young Tokyo Institute of Technology professor, told him of an organic polymer a silvery film consisting of impure polyacetylene that also appeared conductive.
MacDiarmid invited Shirakawa to join him and Heeger for a year at Penn, and, armed with $21,650 in seed money from the Office of Naval Research, they went to work. They soon found that by exposing the polyacetylene to bromine vapor, they could raise its conductivity significantly and from there, an entire field of chemistry was born, one that now promises a number of novel commercial applications.
MacDiarmid is quick to point out that he and his Nobel co-laureates could not have done their groundbreaking work on conducting polymers without crucial government support, first-rate student researchers and an environment that encouraged people to step outside the confines of their disciplines.
Q. What are some of the possible uses for these conducting polymers?
A. Penn has worldwide patent coverage on plastic rechargeable batteries. Then other interests have involved electromagnetic shielding. Weve looked into mixing polyaniline with traditional plastics to cut out electromagnetic interference [from electronic equipment].
The really, really hot area at the moment is light-emitting diodes. In 1990, Professor Richard Friend of Cambridge University in England showed that conducting polymers in their laundered form certain of them could emit light of different colors according to the polymer when anywhere from about three volts to 10 volts were applied across them. Alan Heeger, one of my co-awardees, started off a company in California which brought up to an industrial-commercial stage light-emitting diodes from these conducting polymers, and I understand a few months ago he sold his company to DuPont.
One of the [other] things in which there is a huge amount of interest is plastic electronics. Philips, the electronics company in the Netherlands, has beautiful little plastic chips about the size of a 50-cent piece. Flexible, you can bend them and these they will be producing for about one cent each. They will never replace durable silicon-chip technology for use in outer space, where youre going to have a satellite which is going to last for 20 years, but if you just want to have something which will be used once, which will have a life of, say, 20 days or 20 weeks or 20 months, and where cost is the important thing, then this is fascinating.
Q. Youre originally from New Zealand. What led you to leave?
A. Well, New Zealand is one of the far-flung outreaches of the British Commonwealth. Most of the people well, not the Maori population were [migrants from Britain, and] we all considered it a new country. It became a British possession in 1840, and we always referred to [Britain] as home, even though you were born, your parents were born in New Zealand. And all the young people always wanted to go home, which meant England. We would see the ships in the harbors, and wed say, Oh, thats the home boat, meaning thats a boat that would go to England.
So I put in for a couple of fellowships to go to England, and I was turned down. And at about this time the United States was just starting the Fulbright Fellowships. So I put in for a Fulbright Fellowship, and I was fortunate enough to get one. I went to the University of Wisconsin, where I did a Ph.D. in radiochemistry, and while I was there, I applied for a fellowship from New Zealand Shell [Oil Company] to go to Cambridge [University], and I was lucky enough to get that. ...
[After] Cambridge, I was a junior assistant, temporary lecturer at the University of St. Andrews [in Scotland] for a few months. And my wife, who was American, lived in Wisconsin, found it bitterly cold there and her health wasnt too good. So we then searched around and then we got this position at Penn. And it was interesting Im the only person, I think, whos ever been hired by Penn sight unseen. And at the lowest possible position on the totem pole.
Q. A lecturer?
A. No. I was hired as an instructor. I was hired sight unseen by Charlie Price, who was the chairman of the department then. [He is now an emeritus University Professor.] I guess they thought they were taking quite a gamble. I got promoted after a year to assistant professor, and then things started going. Incidentally, if anybody could help me locate Charlie Price, I would be most grateful. He [once] said to me, Alan, you were the best thing I ever did during my stay here at the University. So you can fool some of the people all of the time.
Q. But why have you stayed here for all 43 years?
A. I, like many people on our faculty, have had many offers to move elsewhere. And I find that Penn has such a very good academic atmosphere. Has very good students at both the undergraduate and graduate level, and has very good opportunities for research, so I thought, really, Penn is pretty much ideal.
Q. I know theyre thrilled in 100 College Hall. How about your
students in Chemistry 461? Whats been their response?
A. Well, I must give you a lovely, cute little story. On Wednesday morning, which was the morning after the announcement, I had the midterm exam, and I was sorry it was the midterm exam right then. So just before it started, a charming young lady in the second row put up her hand and asked, May I say something? I said yes. She said, I liked your photo in the DP. Do I get an A for that? And I said, No, you get an A-plus-plus for that. [laughter]
One of the secretaries in the department told me a few hours later that she was going up on the elevator on Wednesday morning. And in the elevator was one of my Chemistry 461 students going to the exam. And [the student] said, Oh, at least my parents will be pleased, now theyre paying out all this money to Penn, but theyll have a Nobel laureate as my teacher in senior inorganic class.
Originally published on October 26, 2000