Autoclave growth, magnetic, and optical properties of GdB6 nanowires
Autoclave growth, magnetic, and optical properties of GdB6 nanowires
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GdB6 纳米线的高压釜生长、磁性和光学特性
DOI：
10.1016/j.jssc.2017.08.026
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发表时间：
2017
影响因子：
3.3
通讯作者：
Zhao Yanming
中科院分区：
文献类型：
--
作者：
Han Wei;Wang Zhen;Li Qidong;Liu Huatao;Fan Qinghua;Dong Youzhong;Kuang Quan;Zhao Yanming
以Gd、H3 BO 3、Mg和I2为原料，采用高压固相反应（HPSS）方法，在200-240 °C的极低温度下成功制备了高质量的六硼化钆（GdB 6）单晶纳米线。采用XRD、FESEM、HRTEM、XPS、SQUID磁强计和光学测量等手段对样品的结构、形貌、价态、磁性和光学性质进行了研究。HRTEM和SAED结果表明，GdB 6纳米线为单晶结构，且择优生长方向为沿着[001]。XPS谱表明GdB 6中Gd离子的价态为三价。GdB 6中每个Gd ~（3+）的有效磁动量约为6.26μB。光学性质在可见光范围内表现出弱吸收，但在NIR和UV范围内表现出相对强的吸收。低功函数和高近红外吸收可以使GdB 6纳米线成为太阳能电池或其他近红外阻挡应用的潜在太阳辐射屏蔽材料。
High-quality single crystalline gadolinium hexaboride (GdB6) nanowires have been successfully prepared at very low temperatures of 200–240 °C by a high pressure solid state (HPSS) method in an autoclave with a new chemical reaction route, where Gd, H3BO3, Mg and I2were used as raw materials. The crystal structure, morphology, valence, magnetic and optical absorption properties were investigated using XRD, FESEM, HRTEM, XPS, SQUID magnetometry and optical measurements. HRTEM images and SAED patterns reveal that the GdB6nanowires are single crystalline with a preferred growth direction along [001]. The XPS spectrum suggests that the valence of Gd ion in GdB6is trivalent. The effective magnetic momentum per Gd3+in GdB6is about 6.26μB. The optical properties exhibit weak absorption in the visible light range, but relatively strong absorbance in the NIR and UV range. Low work function and high NIR absorption can make GdB6nanowires a potential solar radiation shielding material for solar cells or other NIR blocking applications.