Kumar Sunil, Biswas Subha, Rashid Umar, Mony Kavya S, Chandrasekharan Gokul, Mattiotti Francesco, Vergauwe Robrecht M A, Hagenmuller David, Kaliginedi Veerabhadrarao, Thomas Anoop
Inorganic and Physical Chemistry, Indian Institute of Science, Bengaluru, 560 012, India.
University of Strasbourg and CNRS, CESQ and ISIS (UMR 7006), 67000 Strasbourg, France.
J Am Chem Soc. 2024 Jul 17;146(28):18999-19008. doi: 10.1021/jacs.4c03016. Epub 2024 May 12.
Enhancing the electrical conductance through amorphous nondoped polymers is challenging. Here, we show that vibrational strong coupling (VSC) of intrinsically nonconducting and amorphous polymers such as polystyrene, deuterated polystyrene, and poly(benzyl methacrylate) to the vacuum electromagnetic field of the cavity enhances the electrical conductivity by at least 6 orders of magnitude compared to the uncoupled polymers. Remarkably, the observed extraordinary conductance is vibrational mode selective and occurs only under the VSC of the aromatic C-H(D) out-of-plane bending modes of the polymers. The conductance is thermally activated at the onset of strong coupling and becomes temperature-independent as the collective strong coupling strength increases. The electrical characterizations are performed without external light excitation, demonstrating the role of vacuum electromagnetic field-matter strong coupling in enhancing long-range transport even in amorphous nonconducting polymers.
增强非晶态无掺杂聚合物的电导率具有挑战性。在此，我们表明，诸如聚苯乙烯、氘代聚苯乙烯和聚（甲基丙烯酸苄酯）等本征非导电且无定形的聚合物与腔体的真空电磁场发生振动强耦合（VSC）时，与未耦合的聚合物相比，其电导率提高了至少6个数量级。值得注意的是，观察到的异常电导率具有振动模式选择性，并且仅在聚合物的芳香族C-H（D）面外弯曲模式的VSC下出现。在强耦合开始时，电导率是热激活的，并且随着集体强耦合强度的增加而变得与温度无关。电学表征是在没有外部光激发的情况下进行的，这证明了真空电磁场与物质的强耦合在增强甚至非晶态非导电聚合物中的长程传输方面的作用。
