Chem. J. Chinese Universities ›› 2012, Vol. 33 ›› Issue (09): 1908.doi: 10.3969/j.issn.0251-0790.2012.09.006

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Hydrothermal Synthesis of Ordered Mesoporous Silicas with Extraordinarily Ultra-low Dielectric Constants

LIU Fu-Jian2, HAN Bing1, CAO Yang1, ZOU Yong-Cun1, MENG Xiang-Ju3, XIAO Feng-Shou3   

  1. 1. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University, Changchun 130012, China;
    2. Institute of Applied Chemistry, Shaoxing University, Shaoxing 312000, China;
    3. Key Laboratory of Applied Chemistry of Zhejiang Province, Department of Chemistry, Zhejiang University, Hangzhou 310028, China
  • Received:2011-10-26 Online:2012-09-10 Published:2012-08-14

Abstract:

Ordered mesoporous silica samples with extraordinarily ultra-low dielectric constants(k) were hydrothermally synthesized at different temperatures(150—200℃) via soft-templates including amphiphilic triblock polymers of P123(PEO20-PPO70-PEO20) and F127(PEO106-PPO70-PEO106). The characterizations of XRD and N2 adsorption-desorption isotherms show that these samples have ordered mesostructure, high BET surface area, large pore volume and uniform pore size.29Si MAS NMR spectra show that the samples have much higher silica condensation degree than the ones synthesized at relatively low temperatures. More importantly, these samples exhibit extraordinarily ultra-low dielectric constant(k). For example, ordered mesoporous silica of SBA-15 synthesized at 200℃ gives k value as low as 1.31, which is interpreted by a collaborative effect of large pore volume with high silica condensation degree. These samples with extraordinarily ultra-low dielectric constants would be potentially important for applications of superior insulators in electronic industry.

Key words: Ordered mesoporous material, High temperature synthesis, Silica, Dielectric constant, Condensation degree

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