Bidirectional mediation of TiO2 nanowires field effect transistor by dipole moment from purple membrane

Abstract

Bacteriorhodopsin-embedded purple membrane (bR-PM) is one of the most promising biomaterials for various bioelectronics applications. In this work, we demonstrate that a dipole bio-originated from bR-PM can bidirectionally mediate the performance of a bottom-contact TiO(2) nanowire field effect transistor (FET) for performance improvement. When negative gate voltage is applied, both transfer and output characteristics of the TiO(2) nanowire FET are enhanced by the bR-PM modification, resulting in a hole mobility increased by a factor of 2. The effect of the number of the deposited bR-PM layers on the normalized DeltaI(D) of the FET suggests that the additional electric field generated by the dipole moment natively existing in bR-PM actually boosts the performance of the TiO(2) nanowires FET.

Bio-nano hybrid materials based on bacteriorhodopsin: Potential applications and future strategies

“…5). Therefore, bR increased the hole mobility in the TiO 2 nanowires FET and led to increase in both transfer and output characteristics for bR modified TiO 2 nanowires FET in comparison with bare TiO 2 nanowires FET [63].…”

“…A promising platform for the bioelectronics application of bR-nano hybrid materials has been reported by Li et al [63]. They fabricated the bR modified TiO 2 nanowires FET and investigated the effect of bR on the FET performance.…”

“…After modification with bR, the mobility of the TiO 2 nanowires FET is increased by a factor of 2. Adapted from reference[63].…”

Current trends in nanomaterial embedded field effect transistor-based biosensor

“…TiO 2 NWs in gas sensors and immunosensors have acceptable sensitivity for humidity, hydrogen gas, and Listeria monocytogenes (Li et al, 2010a;Varghese et al, 2003;Wang et al, 2008). TiO 2 is a very interesting component in nanomaterials due to its wide energy gap (between 1.8eV and 4.1eV), which gives a good sensitivity range compared to other materials for biosensing FETs (Wang et al, 2008).…”

Enhanced conductivity of anatase TiO 2 nanowires by La and Co co‐doping

“…TiO 2 nanowire nano-field-effect transistor (nanoFET) encapsulation of biomolecules was presented, and the specificity, sensitivity and selectivity were explored, the results show that PPa/1 †Ab achieved high specificity immobilisation on nanowire (NW) [33]. TiO 2 nanowires FET were modified by bacteriorhodopsin embedded purple member, and the additional electric field can boost the performance of the TiO 2 nanowires [34]. TiO 2 nanofibres FET were fabricated and the electrical properties were qualitatively studied, the results indicated that the TiO 2 nanofibres with a mixed crystalline structure have better transistor characteristics and enhanced electrical property in a top-gate FET device [35].…”