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Colored carbon nitride-based thin film and preparation method thereof

A carbon nitride-based, color technology, applied in chemical instruments and methods, nitrogen compounds, nitrogen and non-metallic compounds, etc., can solve problems such as non-occurrence

Active Publication Date: 2021-06-29
香港城市大学深圳研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, no relevant research has appeared in the prior art

Method used

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  • Colored carbon nitride-based thin film and preparation method thereof
  • Colored carbon nitride-based thin film and preparation method thereof
  • Colored carbon nitride-based thin film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] This embodiment prepares a kind of brown carbon nitride base film, comprises the following steps:

[0056] Put 11.4g of thiourea into the crucible, cover the crucible, and heat the prepolymer in the muffle furnace. The heating steps are r.t.-150°C, 10°C / min; 20min; 390-480℃, 3℃ / min, keep warm for 20min. After cooling, grind the prepolymer and transfer it to the crucible, cover with 5cm×5cm×0.32cm FTO glass, with the conductive surface facing the inside of the crucible, heat in the muffle furnace, the heating step is 0-300°C, 10°C / min; 300-390°C, 1.5°C / min, keep warm for 20min; 390-520°C, 3°C / min, keep warm for 20min; 520-600°C, 3°C / min, keep warm for 20min. After cooling to room temperature, a dark brown carbon nitride film was obtained, such as Figure 2a shown.

[0057] The photoresponse test was performed on an electrochemical workstation, using a three-electrode system, with a platinum sheet as the counter electrode, a silver chloride electrode as the reference e...

Embodiment 2

[0060] In this embodiment, a multicolor carbon nitride-based thin film is prepared, which includes the following steps:

[0061] Mix and dissolve 11.4g thiourea, 0.6g formic acid and 100mL water in a crucible, evaporate to dryness at 100°C, cover the crucible and heat in a muffle furnace to obtain a prepolymer. The heating steps are r.t.-150°C, 10°C / min; 150-390°C, 1.5°C / min, keep warm for 20min; 390-480°C, 3°C / min, keep warm for 20min. After cooling, grind the prepolymer and transfer it to a crucible, cover with 5cm×5cm×0.32cm FTO glass, with the conductive surface facing the inside of the crucible, and heat in a muffle furnace, the heating step is 0-300°C, 10°C / min; 300-390°C, 1.5°C / min, keep warm for 20min; 390-520°C, 3°C / min, keep warm for 20min; 520-600°C, 3°C / min, keep warm for 20min. Cool to room temperature to obtain a multi-colored carbon nitride film with a film thickness of 200nm, such as Figure 2b shown.

[0062] The photoresponse current density of this color...

Embodiment 3

[0064] This embodiment prepares a kind of green carbon nitride base film, comprises the following steps:

[0065] Mix and dissolve 11.4g thiourea, 0.6g nitric acid and 100mL water in a crucible, evaporate to dryness at 100°C, cover the crucible and heat in a muffle furnace to obtain a prepolymer. The heating steps are r.t.-150°C, 10°C / min; 150-390°C, 1.5°C / min, keep warm for 20min; 390-480°C, 3°C / min, keep warm for 20min. After cooling, grind the prepolymer and transfer it to a crucible, cover with 5cm×5cm×0.32cm FTO glass, with the conductive surface facing the inside of the crucible, and heat in a muffle furnace, the heating step is 0-300°C, 10°C / min; 300-390°C, 1.5°C / min, keep warm for 20min; 390-520°C, 3°C / min, keep warm for 20min; 520-600°C, 3°C / min, keep warm for 20min. Cool to room temperature to obtain a green carbon nitride film with a film thickness of 200nm, such as Figure 2c shown.

[0066] The photoresponse current density of this color film is 22μA cm -2 . ...

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Abstract

The invention discloses a colored carbon nitride-based thin film and a preparation method thereof. The colored carbon nitride-based thin film is formed on a substrate by a multi-step thermal deposition method through a modified precursor formed by mixing a modified monomer and a main precursor thiourea. The color of the colored carbon nitride-based thin film can be adjusted by changing the variety and the addition amount of the modification monomers; and the colored carbon nitride-based thin film has better photoelectrocatalytic activity, also has a decorative function, and is low in cost, simple in process and higher in practicability.

Description

technical field [0001] The invention belongs to the field of functional film preparation, and in particular relates to a colored carbon nitride-based film and a preparation method thereof. Background technique [0002] In recent years, graphitic carbon nitride (g-CN) thin film photoelectrodes have been studied for water splitting to produce hydrogen. Research hotspots. [0003] At present, carbon nitride thin films are mostly prepared by spin-coating carbon nitride powder on the substrate, and the prepared thin films have poor compactness and weak photocatalytic activity. Another one-step thermal deposition method is not suitable to use thiourea as the main precursor. The prepared film is porous and has low binding force with the substrate. The corresponding photoelectrode dark current is large, indicating that the electrode is unstable. [0004] In addition, when the carbon nitride thin film photoelectrode is laid on the building, its aesthetics and other issues must also...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/082B01J27/24
CPCC01B21/0605B01J27/24B01J35/39B01J35/33Y02E60/36
Inventor 张瑞勤熊伟
Owner 香港城市大学深圳研究院
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