An optically transparent and UV-light active anode, characterized by high (photo) conductivity, charge mobility and exciton lifetime, based on graphene, grown by CVD, decorated with colloidal TiO2 nanocrystals (NCs), has been fabricated, by a direct and facile solution-based procedure. TiO2 NCs anchor onto graphene by means of p-p stacking interactions occurring between the pyrene-1-butyric acid (PBA) surface coating ligand and the 2-D platform and assemble in a highly interconnected multilayered layout, by means of interligand pi-pi forces, retaining composition and geometry, along with the graphene structure. Remarkably, the PBA-coated TiO2 NCs on the graphene increase its electrical conductivity, electroactivity, and capacitive behavior, as well as photoelectrical response under UV-light, resulting in a 50% enhanced photoelectroactivity and a long exciton recombination lifetime. The photoanodes can be integrated into solar cells as optically transparent electrodes, in photodetectors, FETs and (bio)sensors.
Enhanced photoactivity and conductivity in transparent TiO2 nanocrystals/graphene hybrid anodes / C. Ingrosso, G.V. Bianco, V. Pifferi, P. Guffanti, F. Petronella, R. Comparelli, A. Agostiano, M. Striccoli, I. Palchetti, L. Falciola, M.L. Curri, G. Bruno. - In: JOURNAL OF MATERIALS CHEMISTRY. A. - ISSN 2050-7488. - 5:19(2017), pp. 9307-9315.
|Titolo:||Enhanced photoactivity and conductivity in transparent TiO2 nanocrystals/graphene hybrid anodes|
|Parole Chiave:||Sensitized solar-cells; graphene electrochemistry; CVD graphene; layer; films; electrodes; photoanodes; performance; interface; sensors|
|Settore Scientifico Disciplinare:||Settore CHIM/01 - Chimica Analitica|
Settore CHIM/02 - Chimica Fisica
|Data di pubblicazione:||2017|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1039/C7TA01425B|
|Appare nelle tipologie:||01 - Articolo su periodico|