(1. 華中科技大學材料成型與模具技術(shù)國家重點實驗室，武漢 430074；
2. 華中科技大學材料科學與工程學院，武漢 430074)
摘 要: 采用種子生長法合成了GNRs，并對其進行了不同溫度的熱處理。通過TEM、XRD、UV-vis等手段分析了熱處理對金納米棒的形貌、尺寸及光學性能的影響規(guī)律。結(jié)果顯示：隨著對GNRs的熱處理溫度升高，其LSPR發(fā)生藍移，并且LSPR的半峰全寬(FWHM)明顯減小，產(chǎn)生該現(xiàn)象的原因通過探究平均長徑比為3.31、4.38、4.52的GNRs在110 ℃下保溫不同時間后的LSPR的變化情況得出：GNRs軸向末端的十六烷基三甲基溴化銨 (CTAB)相比側(cè)面狀態(tài)不穩(wěn)定，使得高溫下該處金原子更易脫落導(dǎo)致長度減小明顯，進而造成長徑比減小最終導(dǎo)致LSPR藍移和窄化現(xiàn)象。
關(guān)鍵字: 金納米棒；縱向表面等離子共振；熱處理；光熱性能
（1. State Key Laboratory of Material Processing and Die & Mould
Technology, Wuhan 430074, China;
2. School of Material Science and Engineering
Huazhong University of Science and Technology,Wuhan 430074, China）
Abstract:GNRs were synthesized by seed growth method and heat-treated at different temperatures. The influence of heat treatment on the morphology, size and optical properties of gold nanorods was analyzed by TEM, XRD, UV-vis and other methods. The results show that, as the heat treatment temperature of GNRs increases, the LSPR undergoes a blue shift, and the full-width at half maximum (FWHM) of the LSPR is significantly reduced. The reason for this phenomenon is obtained by investigating the change of LSPR of GNRs with average aspect ratios of 3.31, 4.38, and 4.52 after holding at 110 ℃ for different times; cetyltrimethylammonium bromide (CTAB) at the axial end of GNRs is more unstable than the side, making gold atoms more likely to fall off at high temperatures. This results in a significant reduction in length, which in turn results in a reduction of the aspect ratio and eventually causes LSPR blue shift and narrowing.
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