電紡法制備銀基導電納米纖維及其性能研究
發(fā)布時間：2018-10-18 07:16
【摘要】：導電納米纖維具有電導率高、柔韌性好、長徑比大等優(yōu)點,近年來受到了國內外研究學者的廣泛關注。在眾多制備導電納米纖維的方法中,靜電紡絲技術是最簡單和最常用的方法之一。目前,采用靜電紡絲技術制備的聚合物基導電納米纖維的導電性和穩(wěn)定性均較差,制備的銅基導電納米纖維非常容易氧化且制備過程復雜,這些缺點嚴重限制了它們的應用。本文利用無顆粒型有機銀導電油墨可以在中低溫下還原成單質銀的特點,結合靜電紡絲技術,制備了具有良好導電性和穩(wěn)定性的銀基復合納米纖維。本文制備了無顆粒型有機銀導電油墨,并研究了不同銀鹽、胺類配體、還原劑種類對有機銀導電油墨導電性及穩(wěn)定性的影響。研究發(fā)現(xiàn),采用硝酸銀、異丙胺、乙二醇制備的有機銀導電油墨的導電性和穩(wěn)定性最佳。該導電油墨在150℃處理60 min后銀納米顆粒間空隙較少并且緊密燒結,方阻為0.8Ω/sq;該導電油墨具有較好的穩(wěn)定性,可長期儲存。進而用靜電紡絲技術將制備的無顆粒型有機銀導電油墨進行紡絲,制得了銀基導電納米纖維,并研究了PVP和PEO聚合物配比及含量、有機銀導電油墨含量、環(huán)境濕度、煅燒溫度對紡絲纖維的形貌及導電性的影響。研究發(fā)現(xiàn),當紡絲溶液組分為8 wt%PVP、4 wt%PEO及含0.5 g硝酸銀的有機銀導電油墨時,紡絲纖維形貌和導電性能最佳。當紡絲溶液中有機銀導電油墨含量較高時,紡絲出現(xiàn)嚴重的噴珠現(xiàn)象。當環(huán)境濕度較低時,紡絲纖維表面較為光滑,當環(huán)境濕度達到65%左右時,纖維表面開始出現(xiàn)孔洞并且纖維之間開始粘結。本文進一步研究了銀基導電納米纖維在PI和PET基底上的附著行為,制備出兩種類型的導電薄膜,并研究了導電薄膜的耐溫性、彎折性及附著性等性能。采用PI基底直接接收紡絲纖維制備導電薄膜,研究發(fā)現(xiàn),經270℃煅燒60 min后導電薄膜的方阻為70Ω/sq;該導電薄膜中的銀基導電納米纖維部分嵌入PI基底中,銀基導電納米纖維中銀納米顆粒間緊密堆積但只有部分燒結,纖維直徑較粗;該導電薄膜具有較高的耐溫性、良好的彎折性和附著性。制備了自支撐銀基導電納米纖維,并將其附著在PET基底制備導電薄膜,研究發(fā)現(xiàn),紡絲纖維經300℃煅燒60 min后,銀基導電納米纖維上銀納米顆粒緊密燒結,纖維直徑較細;制備的導電薄膜的方阻為36Ω/sq,同時具有優(yōu)異的彎折性和附著性。
[Abstract]:Conductive nanofibers have many advantages, such as high conductivity, good flexibility, high aspect ratio and so on, which have attracted extensive attention of researchers at home and abroad in recent years. Among the many methods of preparing conductive nanofibers, electrostatic spinning is one of the simplest and most commonly used methods. At present, the conductivity and stability of polymer-based conductive nanofibers prepared by electrospinning technology are poor, and the preparation of copper-based conductive nanofibers is very easy to oxidize and the preparation process is complex. These shortcomings seriously limit their application. In this paper, silver based composite nanofibers with good electrical conductivity and stability were prepared by using the characteristics that non-granular organic silver conductive ink could be reduced to simple silver at medium and low temperature, combined with electrostatic spinning technology. In this paper, no granular organic silver conductive ink was prepared, and the effects of different silver salts, amine ligands and reductants on the conductivity and stability of organic silver conductive ink were studied. It was found that the conductive ink prepared by silver nitrate, isopropylamine and ethylene glycol had the best conductivity and stability. After 60 min treatment at 150 鈩，
本文編號：2278393
[Abstract]:Conductive nanofibers have many advantages, such as high conductivity, good flexibility, high aspect ratio and so on, which have attracted extensive attention of researchers at home and abroad in recent years. Among the many methods of preparing conductive nanofibers, electrostatic spinning is one of the simplest and most commonly used methods. At present, the conductivity and stability of polymer-based conductive nanofibers prepared by electrospinning technology are poor, and the preparation of copper-based conductive nanofibers is very easy to oxidize and the preparation process is complex. These shortcomings seriously limit their application. In this paper, silver based composite nanofibers with good electrical conductivity and stability were prepared by using the characteristics that non-granular organic silver conductive ink could be reduced to simple silver at medium and low temperature, combined with electrostatic spinning technology. In this paper, no granular organic silver conductive ink was prepared, and the effects of different silver salts, amine ligands and reductants on the conductivity and stability of organic silver conductive ink were studied. It was found that the conductive ink prepared by silver nitrate, isopropylamine and ethylene glycol had the best conductivity and stability. After 60 min treatment at 150 鈩，
本文編號：2278393
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