Silver nanowire array electrode and its preparation method and application

Abstract

The invention discloses a silver nanowire array electrode, a preparation method and application thereof. The electrodes are silver nanowires forming an array with a diameter of 50-70nm and a wire length of 250-350nm. The bottom of the array is a silver film of 130-170nm and a copper film of 0.5-1mm; the method is to use a secondary anode on the aluminum sheet first Oxidation method to obtain a through-hole alumina template with a pore diameter of 50-70nm, and then use the ion sputtering method to vapor-deposit a silver film on one side of the alumina template, and then place the alumina template with a silver film on one side in a silver electrolysis solution, use the electrodeposition method to electrodeposit at a constant voltage of 0.08 to 0.12V for 1 to 5 minutes, then place it in the copper electrolyte, use the electrodeposition method to electrodeposit 2.5 to 3.5 at a current of 8 to 12mA / cm2 h, after that, put the aluminum oxide template with silver nanowires in the hole, one side covered with silver film and copper film in sequence, in acid solution or strong alkali solution to corrode the aluminum oxide template, and make silver nanowire array electrode. Array electrodes can be used as sensitive elements for trace detection or reduction of halogenated organic compounds.

Description

technical field [0001] The invention relates to an array electrode and its preparation method and application, in particular to a silver nanowire array electrode and its preparation method and application. Background technique [0002] The nanostructure based on noble metal silver has a good adsorption and catalytic effect on halogen-containing organic compounds, such as chloropropanol, chlorobenzene, chlorophenol, etc. People often use it as a sensitive element-electrode to detect and reduce halogen-containing organic compounds, such as In 2006, pages 4956-4964 of the 51st volume of the British Electrochemical Society reported that AbdirisakA.Isse et al. published an article titled "The Electrochemical Reduction of Halogenated Toluene on a Silver Electrode" (Abdirisak A.Isse, et al, Electrochemical reduction of benzyl Halides at a silver electrode, Electrochimica Acta 51 (2006) 4956-4964) article, which discloses a method of depositing silver particles on a glassy carbon el...

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Problems solved by technology

However, the electrode deposited with silver particles has the defect that the specific surface area of ​​silver is too small, resulting in low activity and low efficiency of adsorption and catalysis.

Although there are also silver nanowire arrays with higher specific surface areas in the prior art, such as a "field emission cathode and its manufacturing method and application" mentioned in the Chinese invention patent specification CN 1155980C published on June 30, 2004, However, its purpose is to provide a new field emission cathode with good field emission performance, low manufacturing cost, and the silver nanowire array as the field emission cathode is difficult to have a large silver film because of the insufficient support of the bottom silver film. Insufficient area leads to relatively low specific surface area, which restricts its sensitivity and accuracy in detecting and reducing halogenated organic compounds

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