The tunable electrical properties of graphene nano-bridges

Abstract

Reduced graphene oxide nano-bridges and tunable electrical transport properties of reduced graphene oxide based transistors are achieved by using tip-based nanolithography. The polarity dependence of the reduction is revealed with a threshold reduction bias of À6 V on the nano-scale tip. The best carrier mobilities up to now for holes and for electrons in reduced-graphene-oxide-based nano-scale transistors are about 5.6 cm 2 V À1 s À1 and 3.2 cm 2 V À1 s À1 at room temperature. Moreover, the tunable output and transport properties have been realized for the first time by the controlled nano-tip electrochemical reaction with different reduction nano-tip biases. These tunable electrical properties of graphene based transistors will be extended to develop various novel optoelectronic and microelectronic applications. It opens a possible way to mass production of a graphene oxide based device, representing a significant step forward for electrical applications.

Tetragonal bismuth bilayer: a stable and robust quantum spin hall insulator

“…Examples include 3D TIs Bi2Se3 (Bi2Te3), [15] BaBiO3, [16] and BiTeI, [17] and 2D TIs Bi(111) bilayer, [18][19][20]bilayers of group III elements with Bi, [21] chemically modified Bi honeycomb lattices, [22][23]as well as Bi4Br4 thin films. [24] In particular, the 1D topological edge states of Bi bilayer have been observed in scanning tunneling microscopy experiments, providing a direct spectroscopic evidence of the TI nature [25] and confirming the theoretical predictions. [18][19][20] The Bi bilayer has a strong outof-plane buckling due to the π-π bonding, and this structural feature is shared in silicene, germanene and stanene [11][12], all of which possess the hexagonal honeycomb structure as in graphene.…”

Self-organization of an optomagnetic CoFe2O4–ZnS nanocomposite: preparation and characterization

“…During the past two decades, nanostructured materials have shown to be of special interest because of their fundamental new properties and for their potential use in a broad range of applications [1][2][3][4][5][6]. In particular, optomagnetic nanocomposites have attracted attention in recent years due to their multifunctional properties, thereby expanding their use in photocatalyis and biomedical application such as multimodal fluorescence imaging, magnetic resonance imaging (MRI), magnetic separation and drug targeting [7][8][9].…”

Recent Advances in Stimulus‐Responsive Nanocarriers for Gene Therapy

“…Ultraviolet light (UV; 10–400 nm), visible light (400–750 nm), or near‐infrared light (NIR; 750–900 nm) may be used as the stimulus. [ 173 ] Although UV light has a higher energy and produces more proficient photochemical reactions, prolonged exposure to UV light may cause damage to the body because it is easily absorbed by hemoglobin, lipids and water and does not penetrate deep into body tissue. [ 174 ] Conversely, NIR light is less energetic but penetrates deeper into body tissue and is more compatible with cells.…”