本文選題：銀納米線 + 低溫?zé)Y(jié)　； 參考：《深圳大學(xué)》2017年碩士論文

【摘要】：銀納米線(AgNWs)因其具有優(yōu)異的導(dǎo)電性、導(dǎo)熱性及良好的生物相容性、抗菌性、催化性等特點(diǎn),被廣泛應(yīng)用于透明電極、醫(yī)藥抗菌、工業(yè)催化等領(lǐng)域。由銀納米線制備的透明導(dǎo)電薄膜不僅導(dǎo)電性好、透光率高,而且還耐彎折,然而盡管銀納米線透明導(dǎo)電薄膜具有如此多的優(yōu)點(diǎn),但是由于銀納米線之間的接觸電阻較大,在透明導(dǎo)電薄膜的制備中往往需要加入粘接劑來增強(qiáng)其與基底的結(jié)合力。為解決這一問題,嘗試通過超聲波焊接工藝來實(shí)現(xiàn)銀納米線的焊接,以達(dá)到不添加粘接劑的目的。采用多元醇還原法制備出了平均長度20μm,直徑50-70nm的高純度銀納米線。對該銀納米線在不同氛圍下的低溫?zé)Y(jié)性能進(jìn)行了研究,結(jié)果表明:在三種氣氛下,銀納米線在150℃以下燒結(jié)時,其形貌均不發(fā)生明顯變化,與原始形貌基本保持一致。當(dāng)溫度上升至200℃時,銀納米線發(fā)生局部熔融現(xiàn)象,且最早出現(xiàn)在銀納米線接觸的節(jié)點(diǎn)處,并隨著燒結(jié)溫度的升高,熔融現(xiàn)象越發(fā)明顯。溫度上升至250℃時,由于銀納米線上存在較多的缺陷,隨著燒結(jié)時間的延長,缺陷部位容易發(fā)生熔斷,使銀納米線熔斷成為數(shù)段短棒狀的納米線。當(dāng)燒結(jié)溫度達(dá)到300℃時,銀納米線開始球化,由原來的線狀變?yōu)槎贪魻钆c球狀的混合體,最終完全熔融為球狀的銀納米顆粒。以此為基礎(chǔ),比較了銀納米線壓力焊接及熱壓焊接效果,在銀納米線的超聲波焊接工藝的過程中,對影響超聲波焊接效果的時間、壓力、溫度因素進(jìn)行了研究,得到了各因素在焊接過程中的影響規(guī)律:在靜壓力作用下,銀納米線首先發(fā)生微量變形,其變形量與施加的壓力值成正比。焊接開始后,銀納米線表面附著的PVP在超聲波的作用下被去除,使其表面出現(xiàn)粗糙化,銀納米線表面得以直接接觸并開始出現(xiàn)連接,隨著焊接時間的延長,銀納米線逐漸形成一張連通的導(dǎo)電網(wǎng)絡(luò),在此過程中溫度對銀納米線的形貌幾乎沒有影響,但適當(dāng)?shù)募訜崮軌蜻M(jìn)一步增加銀納米線與基底的結(jié)合力。選用PET材料作為基底,利用旋涂工藝制備了銀納米線透明導(dǎo)電薄膜,并通過引入超聲波焊接來實(shí)現(xiàn)銀納米線間的相互連接,使得銀納米線嵌入基底以達(dá)到增強(qiáng)導(dǎo)電層與基底的結(jié)合力的作用,最終獲得的透明導(dǎo)電薄膜方阻下降了約50%,霧度降低了約20%。
[Abstract]:Silver nanowires (AgNWs) have been widely used in the fields of transparent electrode, pharmaceutical antibacterial and industrial catalysis because of their excellent electrical conductivity, thermal conductivity and good biocompatibility, antibacterial and catalytic properties. The transparent conductive films prepared by silver nanowires have good conductivity, high transmittance and bending resistance. However, although silver nanowires have so many advantages, the contact resistance between silver nanowires is large. In the preparation of transparent conductive films, adhesive is often added to enhance its adhesion to the substrate. In order to solve this problem, we try to realize the welding of silver nanowires by ultrasonic welding technology, so as to achieve the purpose of not adding adhesive. High purity silver nanowires with average length of 20 渭 m and diameter of 50-70nm were prepared by polyol reduction method. The low temperature sintering properties of the silver nanowires in different atmosphere were studied. The results showed that the morphology of silver nanowires sintered below 150 鈩，

本文編號：2090742