Directional Charge Transport in Layered Two‐Dimensional Triazine‐Based Graphitic Carbon Nitride

Abstract

Triazine-based graphitic carbon nitride (TGCN) is the most recent addition to the family of graphene-type,t wodimensional, and metal-free materials.A lthough hailed as apromising low-band-gap semiconductor for electronic applications,s of ar,o nly its structure and optical properties have been known. Here,w ec ombine direction-dependent electrical measurements and time-resolved optical spectroscopyt o determine the macroscopic conductivity and microscopic charge-carrier mobilities in this layered material "beyond graphene". Electrical conductivity along the basal plane of TGCN is 65 times lower than through the stacked layers,a s opposed to graphite.Furthermore,wedevelop amodel for this charge-transport behavior based on observed carrier dynamics and random-walk simulations.O ur combined methods provide ap ath towards intrinsic charge transport in ad irectiondependent layered semiconductor for applications in fieldeffect transistors (FETs) and sensors.

Electronic and Optical Properties of Protonated Triazine Derivatives

“…The results obtained in this work can be generalized to extended covalently bonded networks of the considered molecular units. These structures, often formed by several layers piled up on top of each other, ,, are evidently stiffer than the isolated moieties considered here. The minor role of distortions in determining both the electronic structure and the optical response upon protonation, which we found in our analysis, corroborates the robustness of our findings in this regard.…”

“…Covalent organic frameworks (COFs) are a novel class of porous materials formed by organic building blocks connected together by covalent bonds . These systems, synthesized so far both in the two- and three-dimensional forms, − have been regarded with particular interest in the last few years, due to their potential for a number of applications, ranging from gas storage − to catalysis − and from chemical sensing − to optoelectronics. − One of the key properties of COFs is their chemical versatility . Even slight modifications in the composition of the backbone structure can lead to substantial variations of the intrinsic properties of the materials and, consequently, to a modulation of their functionalities. − …”

Optical Anisotropy of Carbon Nitride Thin Films and Photografted Polystyrene Brushes

“…One of the few examples was recently reported by Noda et al who reported on the anisotropic in-plane and out-of-plane electrical conductivity, with about two orders of magnitude higher conductivity between the layers than along the plane. [12] In another study, Arazoe et al investigated the pCN actuation in response to humidity variation revealing an anisotropic swelling of the pCN structure. [13] Very recently, our group reported on the synthesis and high refractive index properties of homogeneous pCN thin films with optical quality by chemical capor deposition (CVD).…”

Size Effects of the Anions in the Ionothermal Synthesis of Carbon Nitride Materials

“…Carbon nitride materials have emerged as interesting and chemically tunable, [1][2][3][4][5][6][7][8][9][10] metal-free semiconductors with applications in heterogenous photocatalysis, [11][12][13][14][15] and most recently as active materials in organic light-emitting diodes. [16][17][18] Conventional synthetic protocols for carbon nitride materials center on high-pressure decomposition of CNH-containing molecular, [19,20] ion and vapor deposition of nitrogen ions and carbon, [21] plasma decomposition of methane and N 2 , [22] shock wave compression, [23] sputtering experiments, pulsed laser ablation of graphite in combination with an atomic nitrogen source, and electrochemical approaches.…”