Advances in low dimensional and 2D materials

Abstract

This special issue is focused on the advances in low-dimensional and 2D materials. 2D materials have gained much consideration recently due to their extraordinary properties. Since the isolation of single-layer graphene in Novoselov et al. [Science 306, 666–669 (2004)], the work on graphene analogs of 2D materials has progressed rapidly across the scientific and engineering fields. Over the last ten years, several 2D materials have been widely explored for technological applications. Moreover, the existence in nature of layered crystallographic structures where exotic properties emerge when the thickness is reduced to a few monolayers has enlarged the field of low-dimensional (i.e., quasi-2D) materials. The special topic aims to collect the recent advances in technologically relevant low-dimensional and 2D materials, such as graphene, layered semiconductors (e.g., MoS2, WS2, WSe2, PtSe2, MoTe2, Black-P, etc.), MXenes, and topological insulators, such as Bi2Te3, Sb2Te3, etc.). There is an urgent need for material innovations for the rapid development of the next technologies based on these materials. The scope of this special topic is to address recent trends in 2D materials and hybrid structures and their widespread applications in device technology and measurement.

Impact of gate electrode on free chlorine sensing performance in solution-gated graphene field-effect transistors

“…These observations clearly show that the presence of free chlorine on the graphene surface results in electron withdrawal, leading to an increase in the number of holes in the graphene. Such doping, called surface transfer doping or electrochemical doping, occurs on the surface of two-dimensional materials such as graphene 28,30,31 or semiconductors such as diamond, 32,33 resulting in signicant changes in electronic states. 34 The degree of doping in the graphene depends on the redox potential and the ease with which the reaction occurs and should be reected in the equilibrium electrode potential.…”

A controllably fabricated polypyrrole nanorods network by doping a tetra-β-carboxylate cobalt phthalocyanine tetrasodium salt for enhanced ammonia sensing at room temperature

“…16–18 Compared with electrochemical sensors, which require electrolytes and noble metal electrodes, and the other two types of gas sensors, which are more cumbersome, semiconductor gas sensors are currently a hot research topic because of their ease of operation, simple preparation and compatibility. 19–21…”

“…[16][17][18] Compared with electrochemical sensors, which require electrolytes and noble metal electrodes, and the other two types of gas sensors, which are more cumbersome, semiconductor gas sensors are currently a hot research topic because of their ease of operation, simple preparation and compatibility. [19][20][21] As a P-type semiconductor material, conductive polymers not only have a good gas response to NH 3 , but also have the ability to work at room temperature. Among them, polypyrrole (PPy) is considered a promising material to detect NH 3 because of its high affinity and low redox potential for reduced NH 3 molecules and pyrrole (Py) main chains, 22 especially fast response speed.…”