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An inexpensive and simple approach to enhance plasmon-driven photoreduction reactions at interfaces

A plasmon, interface technology, applied in chemical instruments and methods, non-metallic elements, ion implantation and plating, etc., can solve problems such as short life of excited hot carriers, achieve low defectivity, promote separation, Operational safety effect

Active Publication Date: 2022-03-08
NANJING TECH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem solved by the present invention is: effectively solve the problem of short lifetime of hot carriers excited by plasma metals, and effectively promote charge separation

Method used

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  • An inexpensive and simple approach to enhance plasmon-driven photoreduction reactions at interfaces
  • An inexpensive and simple approach to enhance plasmon-driven photoreduction reactions at interfaces
  • An inexpensive and simple approach to enhance plasmon-driven photoreduction reactions at interfaces

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Adsorption of positively charged organic molecules containing benzene rings on graphene oxide enhances the method principle of plasmon-driven photoreduction at the interface.

[0033] As we all know, there is an electrostatic force of mutual attraction between positive and negative charges. Likewise, this effect also exists in microscopic materials. When in the heterostructure constructed by graphene oxide and plasma metal, charged organic molecules are adsorbed on graphene oxide by physical adsorption. From the perspective of quantum theory, when organic molecules are theoretically positively charged, electrons can be induced. Transfer, when the organic molecule is negatively charged, it can inhibit the transfer of electrons (promote the transfer of holes, because the mean free path of holes is very short, so it mainly shows the behavior of negative electricity repelling each other). Moreover, unlike the energy band structure of common semiconductors, the chargeabilit...

Embodiment 2

[0035] Fabrication of graphene oxide and plasmonic metal composite structures. Firstly, GO nanomaterials were synthesized by the improved Hummer method, as shown in the attached figure 2 As shown, monolayer GO nanosheets were obtained by ultrasonication for 30 min. image 3 shown.

[0036] The preparation method is as follows: graphite (0.75g, 4 (4.5g) were mixed evenly and placed in a 250mL single-necked flask (a magnet was placed in the flask in advance). Put the above flask in an oil bath, adjust the medium speed of the magnet and set the temperature at 50°C, and put 10mL of concentrated H 3 PO 4 with 90mL concentrated H 2 SO 4 The mixed acid solution flows into the bottle wall and is added dropwise; when the temperature rises to 50°C, react for 12 hours. After 12 hours, the above mixture was cooled to room temperature in an ice bath, at this time, the reactant turned purple-green, and then 100 mL of ice-water mixture was slowly added dropwise. Then gradually add 30...

Embodiment 3

[0040] Adsorption of positively charged methyl violet molecules enhances plasmon-mediated reduction of p-nitrothiophenol.

[0041] The composite structure of graphene oxide and silver nanoparticles was used as surface plasmon photocatalyst to catalyze the reduction of p-nitrothiophenol (PNTP) to p-mercaptoazobenzene (DMAB). Among them, the reaction rate and reaction degree are characterized by the characteristic peak of DMAB (γ N＝N ) area and PNTP characteristic peak (γ cs ) Raman scattering intensity ratio The change curve with time is presented, as attached Image 6 as shown in a. When positively charged methyl violet is adsorbed on the surface of silver nanoparticles, the reaction rate of PNTP reduction is significantly accelerated, and the degree of reduction reaction is also significantly enhanced. Additionally by calculating the PNTP reduction The first few seconds to calculate the reaction rate, as attached Image 6 As shown in b, when positively charged methyl ...

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Abstract

The invention proposes a method for enhancing the plasma metal-driven photoreduction reaction at the interface between the plasma metal and graphene oxide by adsorbing a positively charged molecular co-catalyst on the composite structure of the plasma metal and graphene oxide. In this method, the dye molecular co-catalyst can be physically adsorbed on the surface of graphene oxide through π‑π conjugation, the raw materials are economical and cheap, and the operation process is simple and fast. This method has been demonstrated to enhance the plasmon-driven reduction of p-nitrothiophenol (PNTP) at the interface by adsorbing positively charged molecules. In addition, the adsorption of other charged molecules further demonstrates that the photocatalytic reaction driven by plasmon-generated hot carriers at the interface can be tuned.

Description

technical field [0001] The invention relates to a cheap and simple method for enhancing plasmon drive at the interface between plasma metal and graphene oxide, in particular to regulating the photochemical reaction driven by hot carriers generated by plasmon at the interface, which belongs to catalytic energy technology field. Background technique [0002] Solar energy is a clean and renewable energy source. Effective collection of solar energy is one of the important methods to solve the global energy crisis and environmental pollution problems, and photochemical conversion is one of the effective ways. Originally, semiconductors were often used as photocatalysts for photochemical conversion, but due to problems such as excessive band gap and low stability of semiconductors, the efficiency of solar energy utilization was low. In order to improve the utilization efficiency of sunlight, plasmonic metal catalysts have become an effective method to solve this problem. Under p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J19/12C01B32/198C23C14/18
CPCB01J19/12C01B32/198C23C14/185
Inventor 吕刚朱亚萌李卓瑶盛回香王锦刘大伟
Owner NANJING TECH UNIV
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