聚对苯撑/LiNi0.5Fe2O4纳米复合热电材料的制备及其性能研究

吴子华; 谢华清

doi:10.7498/aps.61.076502

摘要

本文以流变相反应法原位合成了聚对苯撑/LiNi0.5Fe2O4纳米复合热电材料,并对其热电性能进行表征,研究了放电等离子烧结时保温时间对其热电性能的影响.结果发现,复合材料铁氧体颗粒粒径为100300nm,其外部被一层聚对苯撑膜包覆.电子在Fe2+和Fe3+之间的跳跃机理在铁氧体电导中占主导作用,因此聚对苯撑/LiNi0.5Fe2O4复合材料具有n型导电特性.随着保温时间增加,复合材料电导率基本不变,但热导率逐渐增大且Seebeck系数逐渐减小,导致热电优值系数降低.由于结合了有机物高电导率和低热导率以及无机材料高赛贝克系数的优点,所制备的复合材料热电性能较单一材料有较大提高.

关键词:

Abstract

Polyparaphenylene/LiNi-ferrite nanocomposites are prepared by a novel rheological phase reaction method. The thermoelectric properties of the as-prepared nanocomposites are characterized and the effect of spark plasma sintering (SPS) conditions is investigated. The TEM images show that the size of LiNi-ferrite is around 100300 nm and the polyparaphenylene has diffused boundaries outside it. The negative value of Seebeck coefficient confirms the n-type conduction, and the n-type conduction is attributed to hopping of electrons from Fe2+ to Fe3+ ions. It is found that the electrical conductivity of nanocomposite does not change with sintering time whereas the Seebeck coefficient decreases and thermal conductivity increases with sintering time. Therefore the figure of merit decreases. Because of the high electrical conductivity and low thermal conductivity of organic material and high Seebeck coefficient of inorganic material, the figure of merit of nanocomposites is improved.

Keywords:

作者及机构信息

1.
上海第二工业大学城市建设与环境工程学院, 上海 201209

基金项目: 新世纪优秀人才计划(批准号:NCET-10-883);东方学者岗位计划资助的课题.

Authors and contacts

1.
School of Urban Development and Environmental Engineering, Shanghai Second Polytechnic University, Shanghai 201209, China

Funds: Project supported by the Program for New Century Excellent Talents in University (Grnat No. NCET-10-883), and Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning.

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施引文献

[1]	Li J B, Li J F 2005 New Energy Materials and Application Technology (Beijing: Tsinghua University Press) p333345 (in Chinese) [李建保, 李敬锋 2005 新能源材料及其应用第一版 (北京:清华大学出版社) 第333--345页]
[2]
[3]	Majumdar A 2004 Science 303 777
[4]
[5]	Pei Y Z, Yang J, Chen L D Zhang W Q, Salvador J R 2009 Appl. Phys. Lett. 95 042101
[6]	Tang X F, Chen L D, Goto T, Hirai T, Yuan R Z 2000 Acta Phys. Sin. 49 1120 (in Chinese) [唐新峰, 陈立东, 後藤孝, 平井敏雄, 袁润章 2000 物理学报 49 1120]
[7]
[8]	Wang Y Y, Cai K F, Yin J L, An B J, Du Y, Yao X 2011 J. Nanopart. Res. 13 533
[9]
[10]
[11]	Ohtaki M, Maehara S, Shinge S 2003 Proc. 22th Int. Conf. Thermoelectrics (France) 171
[12]
[13]	Pichanusakorn P, Bandaru P 2010 Materials Science and Engineering R 67 19
[14]	Liu H, Wang J Y, Cui H M, Shi R J, Hu X B, Zi Z P 2004 Synth. Met. 145 75
[15]
[16]	Hostler S R, Kaul P, Day K, Qu V, Cullen C, Abranson A R, Xiao F Q, Burda C 2006 Proceedings of the intersociety conference onthermomechanical phenomena in electric systems p14001405
[17]
[18]	Pinter E, Fekete Z A, Berkesi O, Makra P, Patzko A, Visy C 2007 J. Phys. Chem. C 111 11872
[19]
[20]
[21]	Yu C, Kim Y S, Kim D, Grunlan J C 2008 Nano Lett. 8 4428
[22]	Hilli M F A, Li S, Kassim K S 2009 Materials Science and Engineering B 158 1
[23]
[24]
[25]	Patrakeev M V, Mitberg E B, Lakhtin A A, Leonidov I A, Kozhevnikov V L, Kharton V V, Avdeev M, Marques F M B 2002 Journal of Solid State Chemistry 167 203
[26]	Su X L, Tang X F, Li Y 2010 Acta Phys. Sin. 59 2860 (in Chinese)[苏贤礼, 唐新峰, 李涵 2010 物理学报 59 2860]
[27]
[28]	Patrakeev, M V, Mitberg, E B, Lakhtin A A, Leonidov I A, Kozhevnikov V L, Kharton V V, Avdeev M, Marques F M B 2002 Journal of Solid State Chemistry 167 203
[29]
[30]	Chen L D, Xiong Z, Bai S Q 2010 Journal of Inorganic Materials 25 561 (in Chinese) [陈立东, 熊震, 柏胜强 2010 无机材料学报 25 561]
[31]
[32]	Zhang B, Sun J, Katz H E, Fang F, Opila R L 2010 ACS Applied Materials Interfaces 2 3170
[33]
[34]	Heremans J P, Jovovic V, Toberer E S, Saramat A, Kurosaki K, Charoenphakdee A, Yamanaka S, Snyder G J 2008 Science 321 554
[35]
[36]
[37]	Mahan G D, Sofo J O 1996 Proc. Natl. Acad. Sci. 93 7436
[38]
[39]	Malen J A, Yee S K, Majumdar A, Segalman R A 2010 Chem.Phys. Lett. 491 109
[40]
[41]	Jiang J, Li Y L, Xu G J, Cui P, Wu T, Chen L D, Wang G 2007 Acta Phys. Sin. 56 2858 (in Chinese) [蒋俊, 李亚丽, 许高杰, 崔平, 吴汀, 陈立东, 王刚 2007 物理学报 56 2858]
[42]	Liu X J 2007 Mater. Rev. 2 27 (in Chinese) [刘显杰 2007 材料导报网刊 2 27]
[43]
[44]	Kharabe R G, Devan R S, Chougale B K 2008 Journal of Alloysand Compounds 463 67
[45]

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