Wafer-scale growth of two-dimensional graphitic carbon nitride films

Liu, Zhiyu; Wang, Chunfeng; Zhu, Zhili; Lou, Qing; Shen, Cheng‐Long; Chen, Yancheng; Sun, Junlu; Ye, Yangli; Zang, Jinhao; Dong, Lin; Shan, Chongxin

doi:10.1016/j.matt.2021.02.014

Cited by 62 publications

(28 citation statements)

References 58 publications

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“…The membrane stability was appropriate. Furthermore, the role of liquid layer thickness was important to control the alignment of GO laminate which generally depends on the withdrawal speed, liquid viscosity, and the surface tension of the membrane [121][122][123].…”

Section: Dip-coatingmentioning

confidence: 99%

Graphene Oxide and its Derivatives for Gas Separation Membranes

2021

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Graphene oxide (GO), a derivative of graphene with a hydrophilic 2D crystalline nanostructure and being an exfoliated form of graphite, is designed with several oxygen-functional groups. Due to its characteristics it has attracted much interest for applications for gas separation membranes. This review focuses on GO-containing membranes for gas separation. A basic look at gas separation membranes is presented, and the properties of graphene, GO, reduced GO (RGO) as well as their preparation approaches are covered. Different methods for fabrication of GO membranes in the style of mixedmatrix membranes, thin-film composites, layered GO membranes etc. are investigated. The gas separation performance of fabricated GO membranes is evaluated, highlighting recent developments and prospectives. Finally, future trends of GO membranes are described.

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Section: Dip-coatingmentioning

confidence: 99%

Graphene Oxide and its Derivatives for Gas Separation Membranes

2021

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“…reported the growth of wafer‐scale 2D CNTFs by a vapor‐phase transport‐assisted condensation method and their subsequent use in the fabrication of a photodetector array. [ 29 ]…”

Section: Introductionmentioning

confidence: 99%

“…[28] Last year, Liu et al reported the growth of wafer-scale 2D CNTFs by a vapor-phase transport-assisted condensation method and their subsequent use in the fabrication of a photodetector array. [29] Despite the advantageous physicochemical properties, nontoxicity, low cost, and high stability of carbon nitrides, the applications in photoenergy conversion are greatly limited. This is due to the rapid recombination of photogenerated electron-hole pairs and the short carrier diffusion.…”

Section: Introductionmentioning

confidence: 99%

Carbon Nitride Thin Film‐Sensitized Graphene Field‐Effect Transistor: A Visible‐Blind Ultraviolet Photodetector

Palanisamy

Mitra

Batra

et al. 2022

Adv Materials Inter

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Ultraviolet (UV) photodetectors often suffer from the lack of spectral selectivity due to strong interference from visible light. In this study, the exceptional electrical properties of graphene and the unique optical properties of carbon nitride thin films (CNTFs) are used to design visible‐blind UV photodetectors. First, polycrystalline CNTFs with different thicknesses (12–94 nm) are produced by thermal vapor condensation. Compared to the bulk carbon nitride powder, these films have a considerable sp2 nitrogen deficiency, which is thickness dependent. In addition to showing a wider bandgap than the bulk counterpart, their optical absorption profile (in the ultraviolet–visible range) is unique. Critically, the absorbance falls sharply above 400 nm, making the CNTFs suitable for ultraviolet photodetection. As a result, graphene field‐effect transistors (GFETs) sensitized with CNTFs show 103 A W−1 responsivity to UV radiation, a stark contrast to the negligible value obtained in the visible spectrum. The effect of film thickness on the photoresponse is determined, with the thinner CNTF leading to much better device performance. The CNTF/GFET photodetectors are also characterized by their fast response and recovery times, 0.5 and 2.0 s, respectively. These findings pave a simple route for the development of sensitive, visible‐blind UV photodetectors.

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“…The molten phase depends largely on the selection of precursors, which may alter the PCN film deposition route and influence the PCN properties such as the band gap structure, the degree of polymerization, and the crystallinity [16,[31][32][33][34]. Melamine sublimates at 335°C, melts at 354°C, and transforms into melem at 389°C [35][36][37]. However, the deposition of PCN using gaseous melamine is highly-selective, which can only be deposited on bare FTO in polished clean porcelain boat or in the presence of S element [20,38].…”

Section: Introductionmentioning

confidence: 99%

Integrated molten and vapor condensation of polymeric carbon nitride photoelectrode towards efficient water splitting

Wang

Tan

et al. 2022

Sci. China Mater.

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Polymeric carbon nitride (PCN) has received extensive attention in suspension photocatalysis, whereas the preparation of high-quality PCN film is still at an initial stage, limiting its practical application in photoelectrochemical (PEC) systems. Herein, an integrated molten and vapor condensation route is realized using small molecule precursors dicyandiamide (DCDA) and thiourea (TU) to form PCN film photoelectrode with high performance. The in-situ deposition route endows the PCN film with a composite structure including a thick porous zone with suitable thickness for light absorption and thin compact zone with a higher C/N ratio for better charge transportations. The growth of the specific film and the functions of precursors DCDA and TU are investigated in detail. Owing to the unique condensation route and film structure, this PCN film exhibits excellent performance in PEC water splitting with a photocurrent density of ca. 140 μA cm −2 in 0.1 mol L −1 NaOH electrolyte at 1.23V RHE , which is competitive or higher than the results of the reported PCN photoanodes prepared by the molten-mediated method and thermal vapor condensation. The integrated molten and vapor condensation strategy is enlightening for comprehending the growth of PCN photoelectrodes.

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Wafer-scale growth of two-dimensional graphitic carbon nitride films

Cited by 62 publications

References 58 publications

Graphene Oxide and its Derivatives for Gas Separation Membranes

Graphene Oxide and its Derivatives for Gas Separation Membranes

Carbon Nitride Thin Film‐Sensitized Graphene Field‐Effect Transistor: A Visible‐Blind Ultraviolet Photodetector

Integrated molten and vapor condensation of polymeric carbon nitride photoelectrode towards efficient water splitting

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