Bi<sub>2</sub>Te<sub>3</sub>纳米线的液相法合成及其结构表征

Publisher: 汉斯出版社

ISSN: 2326-3520

Source: Advances in Condensed Matter Physics, Vol.2, Iss.4, 2013-11, pp. : 97-6

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Abstract

<div style="text-align:justify;"> <a name="OLE_LINK48"></a><a name="OLE_LINK47"></a><span style="line-height:1.5;">利用热电材料能够实现温差发电和热电制冷</span><span style="line-height:1.5;">,所以可以有效地缓解日趋严重的能源危机,</span><a name="OLE_LINK50"></a><a name="OLE_LINK49"></a><span style="text-indent:0cm;line-height:1.5;">Bi<sub>2</sub>Te<sub>3</sub></span><span style="line-height:1.5;">目前是室温条件下热电性能最好的热电材料</span><span style="line-height:1.5;">。</span><a name="OLE_LINK52"></a><a name="OLE_LINK51"></a><span style="line-height:1.5;">材料的低维化能够很大程度地提升其自身的性能</span><span style="line-height:1.5;">,</span><span style="text-indent:0cm;line-height:1.5;">Bi<sub>2</sub>Te<sub>3</sub></span><span style="line-height:1.5;">纳米线具有更好的热电转换效率。</span><a name="OLE_LINK56"></a><a name="OLE_LINK55"></a><span style="line-height:1.5;">利用液相法能够很成功和方便地在实验室合成</span><span style="text-indent:0cm;line-height:1.5;">Bi<sub>2</sub>Te<sub>3</sub></span><span style="line-height:1.5;">纳米线</span><span style="line-height:1.5;">,</span><a name="OLE_LINK18"></a><a name="OLE_LINK17"></a><span style="line-height:1.5;">实验中先反应生成</span><span style="line-height:1.5;">Te</span><span style="line-height:1.5;">纳米线胶体溶液,然后再在其基础上合成</span><span style="text-indent:0cm;line-height:1.5;">Bi<sub>2</sub>Te<sub>3</sub></span><span style="line-height:1.5;">纳米线</span><span style="line-height:1.5;">。</span><a name="OLE_LINK60"></a><a name="OLE_LINK59"></a><span style="line-height:1.5;">热处理温度选定为</span><span style="line-height:1.5;">170</span><span style="line-height:1.5;">℃</span><span style="line-height:1.5;">,研究发现加热反应的时间会显著影响所制备样品的结晶性</span><a name="OLE_LINK62"></a><a name="OLE_LINK61"></a><span style="line-height:1.5;">。实验中按照不同的加热反应时间来分成三组进行对比</span><span style="line-height:1.5;">,通过</span><span style="line-height:1.5;">X</span><span style="line-height:1.5;">射线衍射</span><span style="line-height:1.5;">(</span><span style="line-height:1.5;">XRD</span><span style="line-height:1.5;">)</span><span style="line-height:1.5;">、扫描电镜</span><span style="line-height:1.5;">(</span><span style="line-height:1.5;">SEM</span><span style="line-height:1.5;">)</span><span style="line-height:1.5;">和透射电镜</span><span style="line-height:1.5;">(</span><span style="line-height:1.5;">TEM</span><span style="line-height:1.5;">)</span><span style="line-height:1.5;">分析其结构和形貌,</span><a name="OLE_LINK64"></a><a name="OLE_LINK63"></a><span style="line-height:1.5;">对比得知加热</span><span style="line-height:1.5;">90 min</span><span style="line-height:1.5;">所制备的</span><span style="text-indent:0cm;line-height:1.5;">Bi<sub>2</sub>Te<sub>3</sub></span><span style="line-height:1.5;">纳米线的结晶度和产率都比加热</span><span style="line-height:1.5;">30 min</span><span style="line-height:1.5;">和</span><span style="line-height:1.5;">60 min</span><span style="line-height:1.5;">的要好</span><span style="line-height:1.5;">,表明液相法合成</span><span style="text-indent:0cm;line-height:1.5;">Bi<sub>2</sub>Te<sub>3</sub></span><span style="line-height:1.5;">纳米线需要一个较长的反应过程,适量延长加热反应时间有助于获得较高结晶质量的</span><span style="text-indent:0cm;line-height:1.5;">Bi<sub>2</sub>Te<sub>3</sub></span><span style="text-indent:0cm;line-height:1.5;"></span><span style="text-indent:0cm;line-height:1.5;"></span><span style="text-indent:0cm;line-height:1.5;">纳米线。</span> </div><div style="text-align:justify;"> <span style="line-height:1.5;">Thermoelectric materials, which can covert heat to electric energy for power generation and conversely con- vert electric energy to heat energy for refrigeration, thereby alleviate the growing energy crisis effectively.</span><span style="text-indent:0cm;line-height:1.5;">Bi<sub>2</sub>Te<sub>3 </sub></span><span style="text-indent:0cm;line-height:1.5;">is currently the best thermoelectric material for room temperature applications. Materials of lower dimensions can be used to obtain better properties, and </span><a name="OLE_LINK70"></a><a name="OLE_LINK69"></a><span style="text-indent:0cm;line-height:1.5;">therefore,</span><span style="text-indent:0cm;line-height:1.5;">Bi</span><sub sty