层层组装法制备(LDH/DNA/LDH/LTO)n多层复合膜及其红外辐射性能
Layer-by-Layer Assembly and Infrared Emissivity of (LDH/DNA/LDH/LTO)n Hybrid Films
作者单位E-mail
王泳娟 东南大学化学化工学院, 江苏省光电功能材料工程实验室, 南京 211189 wangyongjuan0630@126.com 
周钰明 东南大学化学化工学院, 江苏省光电功能材料工程实验室, 南京 211189  
何曼 东南大学化学化工学院, 江苏省光电功能材料工程实验室, 南京 211189  
贺强 东南大学化学化工学院, 江苏省光电功能材料工程实验室, 南京 211189  
仲洋洋 东南大学化学化工学院, 江苏省光电功能材料工程实验室, 南京 211189  
摘要: 采用层层自组装(LBL)的方式将带负电荷的层状氧化钛(LTO)纳米片以及DNA分子和带正电荷的层状双氢氧化物(LDH)纳米片交替组装,制备了一种人工设计的杂化薄膜,并研究了样品在8~14 μm波段的红外发射率。X射线衍射(XRD)结果表明,(LDH/DNA/LDH/LTO)n杂化膜在垂直于基底的方向呈长程堆积的有序结构,DNA分子链和LTO纳米片均以单层的形式平铺在LDHs层板间。从扫描电子显微镜(SEM)和原子力显微镜(AFM)图像可以看出,薄膜呈现出均匀的、连续的表面形态。通过能量色散X射线光谱(EDS)和X射线光电子能谱(XPS)分析,确认了薄膜的组分,且每一种组分都均匀地平铺在每一个组装单层中,在垂直于基底的方向有序堆积形成均匀的薄膜。由于多组分之间存在协同作用,而且规整有序的层状薄膜结构的构筑增强了不同组分之间的界面效应、提供了平整光滑的薄膜表面,使该复合薄膜的红外发射率降低至0.419。这些结果清楚地表明,层层自组装方式制备的杂化复合膜能有效降低其红外发射率。
关键词: LDH  DNA  层状氧化钛  层层自组装  有机-无机杂化材料  红外发射率
基金项目: 国家自然科学基金(No.51673040)、江苏省自然科学基金(No.BK20171357,BK20180366)、中央高校基本科研业务费专项资金(No.3207048418、2242018k30008)、江苏高校优势学科建设工程项目(No.1107047002)、江苏省科技成果转化项目(No.BA2018045)、江苏省联合基金项目(No.BY2016076-01)和广西清洁制浆造纸重点实验室开放项目(No.KF201605)资助
Abstract: Herein, by using sequentially electrostatic layer-by-layer (LBL) deposition method, the artificialdesigned hybrid films were fabricated through the alternatively assemble of negatively charged layered titanium oxide (LTO) nanosheets and DNA molecules with positively charged layered double hydroxide (LDH) nanosheets. The infrared emissivity values at the wavelength of 8~14 μm of the as-synthesized samples were investigated. The X-ray diffraction (XRD) results demonstrate that the (LDH/DNA/LDH/LTO)n hybrid films were orderly stacked on the substrate in the normal direction, in which the DNA molecules and LTO nanosheets were accommodated as monolayer between the LDH nanosheets layers, respectively. It can be seen from the scanning electron microscope (SEM) and atomic force microscope (AFM) images that the surface morphology of the film was uniform and continuous. The energy dispersive X-ray spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS) analysis verify the composition, the homogenous element distribution, and the well-ordered structure in the multilayer films. This multilayered hybrid film with tetra-layer units possessed a low infrared emissivity value of 0.419 based on the synergistic effect of its multi-components, the interfacial interaction between different layers and the uniform and smooth surface. These results clearly demonstrate that the ordered LBL assembly of the artificial designed hybrid film is quite effective in decreasing the infrared emissivity value.
Keywords: LDH  DNA  layered titanium oxide  layer-by-layer  organic-inorganic hybrid composites  infrared emissivity
投稿时间:2020-03-31 修订日期:2020-08-06
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王泳娟,周钰明,何曼,贺强,仲洋洋.层层组装法制备(LDH/DNA/LDH/LTO)n多层复合膜及其红外辐射性能[J].无机化学学报,2020,36(10):1977-1987.
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