CAJ | 학술논문

提供一种新颖简单的银微米线的湿化学制备方法.在反应温度为50℃的条件下,把硫酸亚铁溶液逐渐滴加到含有柠檬酸的硝酸银溶液中,合成银微晶体.采用扫描电镜(SEM)和X射线衍射仪(XRD)对所制备的银微晶体进行表征.结果表明:所制备的银微晶体主要由大量的银微米线组成；银微晶体的形态与反应温度有很强的联系:当硝酸银浓度降低时,银微米线的长度和直径都逐渐增大,且较低的硝酸银浓度不利于生成更多的银微米线.降低硫酸亚铁浓度时也出现类似的结果.柠檬酸的用量对银微晶体的微观形态有很大的影响.根据银微米线的形成机理,推断柠檬酸在Oswald熟化形成银微米线的过程中起着非常重要的作用.
제공일충신영간단적은미미선적습화학제비방법.재반응온도위50℃적조건하,파류산아철용액축점적가도함유저몽산적초산은용액중,합성은미정체.채용소묘전경(SEM)화X사선연사의(XRD)대소제비적은미정체진행표정.결과표명:소제비적은미정체주요유대량적은미미선조성；은미정체적형태여반응온도유흔강적련계:당초산은농도강저시,은미미선적장도화직경도축점증대,차교저적초산은농도불리우생성경다적은미미선.강저류산아철농도시야출현유사적결과.저몽산적용량대은미정체적미관형태유흔대적영향.근거은미미선적형성궤리,추단저몽산재Oswald숙화형성은미미선적과정중기착비상중요적작용.
A novel and facile wet-chemical method for synthesis of silver microwires was developed.The well-defined particles were prepared by adding an iron (Ⅱ) sulfate heptahydrate solution into a silver nitrate solution containing citric acid drop by drop at 50 ℃.The resulting products were characterized by scanning electron microscopy and X-ray diffraction.It was found that the particles consisted of numerous silver microwires.The reaction temperature greatly affected the morphologies of the as-prepared particles.Both of the mean length and width of the silver microwires increased with the decrease of the concentration of silver nitrate.And the lower concentration was unfavorable for the formation of more silver microwires.Similar findings were also observed when the concentration of iron (Ⅱ) sulfate was decreased.The amount of citric acid also greatly affected the shape of the as-prepared particles.It was concluded that citric acid was the key role in the formation of silver microwires via the Oswald ripening mechanism.