Single cycloparaphenylene molecule devices: Achieving large conductance modulation via tuning radial π-conjugation.

ABSTRACT: Conjugated macrocycles cycloparaphenylenes (CPPs) have unusual size-dependent electronic properties because of their unique radially π-conjugated structures. Contrary to linearly π-conjugated molecules, their highest occupied molecular orbital (HOMO)–lowest unoccupied molecular orbital (LUMO) gap shrinks as the molecular size reduces, and this feature can, in principle, be leveraged to achieve unexpected size-dependent transport properties. Here, we examine charge transport characteristics of [n]CPPs (n = 5 to 12) at the single molecule level using the scanning tunneling microscope–break junction technique. We find that the [n]CPPs have a much higher conductance than their linear oligoparaphenylene counterparts at small ring size and at the same time show a large tunne

SUBMITTER: Lv Y 

PROVIDER: S-EPMC8694625 | biostudies-literature | 2021 Dec

REPOSITORIES: biostudies-literature