Nanostructured ZnO films: a study of molecular influence on transport properties by impedance spectroscopy

SAPPIA, LUCIANO; TRUJILLO, MATÍAS; LORITE, ISRAEL; MADRID, ROSSANA; TIRADO, MONICA; COMEDI, DAVID; ESQUINAZI, PABLO

MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2015 vol. 200 p. 124 - 131

0921-5107

Nanomaterials such as ZnO has been used to build glucose sensors due to its highisoelectric point, which is important when a protein like glucose oxidase (GOx) is attached to a surface. It also creates a biological friendly environment to preserve the activity of the enzyme. In this work we study the electrical transport properties of ZnO thin films (TF) and single crystals (SC) towards different solutions by using impedance spectroscopy. We have found thatthe composition of the liquid, by means of the charge of the ions, produces strong changes in the transport properties of the TF. The enzyme GOx solved in PBS has the mayor effect in the conduction thought the films, which could be explained by the entrapment of carriers in the grain boundaries of the TF. These results will help the design of a new concept in glucose biosensing.