(中南大學(xué) 材料科學(xué)與工程學(xué)院，長沙 410083)
摘 要: 采用液相化學(xué)法，以檸檬酸三鈉為封端劑、單寧為還原劑和銀氨溶液為前驅(qū)體制備了矩形銀微米線。運用SEM和XRD對銀微米線的表面形貌和晶體結(jié)構(gòu)進(jìn)行了分析。結(jié)果表明：制備形貌均一的銀微米線的最佳溫度為25 ℃，過高和過低的溫度均不利于銀微米線的制備；較低的反應(yīng)物濃度有利于銀微米線的生長，而且銀線的長度隨著反應(yīng)物濃度的降低而增長；封端劑對銀微米線的形貌調(diào)控起到重要作用，通過調(diào)節(jié)檸檬酸三鈉的濃度，可以使產(chǎn)物從無規(guī)則的銀顆粒演變成形貌均一的銀微米線，再變成球狀顆粒；通過優(yōu)化制備工藝可以制備出形貌均一、直徑為0.25~0.6 μm、長度約20 μm、橫截面為矩形的銀微米線。
關(guān)鍵字: 銀微米線；液相化學(xué)法；合成
（School of Materials Science and Engineering, Central South University, Changsha 410083, China）
Abstract:Silver microwires were synthesized via a solution-phase chemical reduction method with trisodium citrate as the capping agent, tannin as the reductant and Tollen’s reagent as the precursor. The morphology and crystal structure of the products were characterized by scanning electron microscopy and X-ray diffraction. It is found that uniform silver microwires can be obtained at optimum temperature of 25 ℃. Too high and low temperatures are not conducive to the formation of silver wires. A low reactant concentration is favorable for the growth of silver microwires. The length of silver wires increases with the decrease of the reactant concentration. The capping agent plays a key role in determining the shape of product. The silver product with irregular, wire or spherical shape can be obtained by adjusting the concentration of trisodium citrate. Uniform rectangular silver microwires with 0.25-0.6 μm in diameter and 20 μm in length can be obtained by the process optimization.
Key words: silver microwire; solution-phase chemical method; synthesis
