以Si粉、SiO2粉和人造石墨为原料，在1480℃、4 kW、80 min的真空微波辐照条件下快速高效地合成SiC纳米线。利用SEM、TEM、XRD等对所得产物的微观结构解析表明，在未使用催化剂的条件下，基于气固( VS)机制可成功制备出β型SiC。根据坩埚中的部位不同，所得SiC呈现出不同的形貌。坩埚上层的产物呈亮绿色，较为纯净，主要为直径约150 nm的纳米棒，并含有部分微米级SiC晶粒，表面氧化迹象不明显。其余部分产物呈灰绿色，主要是直径为20~50 nm的SiC/SiO2同轴纳米线(表层的SiO2厚度约2 nm)，并夹杂有未反应完全的石墨和SiO2。利用波长为240 nm的激发光分别对SiC纳米棒和同轴纳米线的光致发光特性的测试表明，两者均可观察到峰位在390 nm左右的发射峰，此结果与所报道的β-SiC纳米材料的发光性能相比，蓝移程度更高。
SiC nanowires were synthesized by a microwave-heating method at 1480 ° C for 80 min under vacuum, using silicon powder, silica dioxide powder and artificial graphite as raw materials. SEM, TEM and XRD were used to investigate the microstruc-ture of the samples and excitation light with wavelength of 240 nm was used to test the photoluminescence properties of the products. Results indicated thatβ-SiC can be synthesized directly without using a catalyst by the vapor-solid growth mechanism. The samples exhibited different morphologies and sizes at different zones due to the temperature differences. The products in an upper crucible were bright-green, relatively pure SiC, consisting of mainly nano-rods with a diameter of about 150 nm and small amount of SiC micro-crystals, and surface oxidation was not obvious. The products in other zones were grey-green with lots of SiC/SiO2 coaxial nanowires with a diameter around 20-50 nm and a SiO2 surface layer of thickness about 2 nm, and there was also some un-reacted graphite and silica dioxide. Both the SiC nano-rods and SiC/SiO2 coaxial nanowires exhibited a strong broad photoluminescence peak at a wavelength of about 390 nm and a high degree of blue-shift compared with the reported luminescence ofβ-SiC nano-mate-rials.
参考文献
| [1] | Magyar, A.P.;Aharonovich, I.;Baram, M.;Hu, E.L. .Photoluminescent SiC tetrapods[J].Nano letters,2013(3):1210-1215. |
| [2] | Feng DH.;Jia TQ.;Li X.;Xu ZZ.;Chen J.;Deng SZ.;Wu ZS.;Xu NS. .Catalytic synthesis and photoluminescence of needle-shaped 3C-SiC nanowires[J].Solid State Communications,2003(8):295-297. |
| [3] | J. Y. Fan;X. L. Wu;Paul K. Chu .Low-dimensional SiC nanostructures: Fabrication, luminescence, and electrical properties[J].Progress in materials science,2006(8):983-1031. |
| [4] | Dai H J;Wong E W;Lu Y Z et al.Synthesis and characteriza-tion of carbon nanorods[J].SCIENCE,1995,375:769-772. |
| [5] | 刘冬,余雁,张求慧,田根林,程海涛.竹炭为模板高温法制备SiC纳微米棒[J].新型炭材料,2011(06):435-440. |
| [6] | 武向阳,靳国强,郭向云.溶胶-凝胶中Fe催化剂用量对β-SiC堆积缺陷和形貌的影响[J].新型炭材料,2005(04):324-328. |
| [7] | Shen GZ;Bando Y;Ye CH;Liu BD;Golberg D .Synthesis, characterization and field-emission properties of bamboo-like beta-SiC nanowires[J].Nanotechnology,2006(14):3468-3472. |
| [8] | 王峰,王秋实,崔启良,张剑,邹广田.直流电弧自催化合成β-SiC纳米线[J].无机化学学报,2009(06):1026-1030. |
| [9] | 卢斌,刘吉轩,朱华伟,焦羡贺.微波加热合成SiC纳米线的研究[J].无机材料学报,2007(06):1135-1138. |
| [10] | 尉国栋 .微波辅助法合成碳化硅一维纳米材料及其性质的研究[D].长春:吉林大学,2009. |
| [11] | Zhang L G;Yang W Y;Jin H et al.Ultraviolet photolumines-cence from 3C-SiC nanorods[J].Applied Physics Letters,2006,89:143101-143103. |
| [12] | 黄珊,王继刚,刘松,李凡.高能微波辐照条件下SiC晶粒的生长过程分析[J].无机材料学报,2014(02):149-154. |
| [13] | Ryu Y W;Tak Y;Yong K J .Direct growth of core-shell SiC-SiO2 nanowires and field emission characteristics[J].Nanotech-nology,2005,16:370-374. |
| [14] | Meng A;Li ZJ;Zhang JL;Gao L;Li HJ .Synthesis and Raman scattering of beta-SiC/SiO2 core-shell nanowires[J].Journal of Crystal Growth,2007(2):263-268. |
| [15] | Jigang Wang;Song Liu;Tao Ding;Shan Huang;Cheng Qian .Synthesis, characterization, and photoluminescence properties of bulk-quantity β-SiC/SiO_x coaxial nanowires[J].Materials Chemistry and Physics,2012(2/3):1005-1011. |
| [16] | Seo WS.;Koumoto K. .STACKING FAULTS IN BETA-SIC FORMED DURING CARBOTHERMAL REDUCTION OF SIO2[J].Journal of the American Ceramic Society,1996(7):1777-1782. |
| [17] | Zhang R Q;Lifshitz Y;Lee S T .Oxide-assisted frowth of semicon-ducting nanowires[J].Advanced Materials,2003,15:635-640. |
| [18] | 吴玲玲 .一维SiC纳米材料的合成制备与测试表征[D].浙江大学,2007. |
| [19] | Wei J;Li K Z;Li H J et al.Photoluminescence performance of SiC nanowires,whiskers and agglomerated nanoparticals synthe-sized from actived carbon[J].PHYSICA E,2009,41:1616-1620. |
| [20] | Niu J J;Wang J N .A simple route to synthesize scales of aligned single-crystalline SiC nanowires arrays with very small diameter and optical properties[J].PHYSICA B,2007,111:4368-4373. |
| [21] | Hu J Q;Bando Y;Zhan J H et al.Fabrication of ZnS/SiC nanocables,SiC-shelled ZnS nanoribbons(and sheets),and SiC nanotubes(and tubes)[J].Applied Physica Letters,2004,85:2932-2934. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%