Self-assembly of multiferroic core-shell composites using DNA functionalized nanoparticles.
Self-assembly of multiferroic core-shell composites using DNA functionalized nanoparticles.
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DOI：
10.1016/j.jmmm.2018.03.075
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发表时间：
2018-08-15
影响因子：
2.7
通讯作者：
Srinivasan G
中科院分区：
文献类型：
--
作者：
Banerjee A;Zhang J;Zhou P;Tuppil K;Sreenivasulu G;Qu H;Zhang T;Timilsina R;Chavez FA;Srinivasan G
采用脱氧核糖核酸（DNA）辅助自组装法制备了铁氧体-铁电核壳纳米粒子，并研究了铁电相之间的应变介导磁电相互作用。纳米颗粒的类型和大小是变化的，DNA接头序列也是变化的。制备了以600 nm钛酸钡（BTO）为核、以200 nm镍铁氧体（NFO）为壳和以200 nm BTO为核、以50 nm镍钴铁氧体（NCFO）为壳的两种粒子。这些颗粒通过含有19、18或30个碱基对的三种不同的寡聚DNA连接。从电子显微镜和扫描微波显微镜图像中可以明显看出核壳结构。在磁场中组装了核壳颗粒的薄膜和圆盘，并用于低频ME电压系数（MEVC）和磁介电效应的测量。膜上的MEVC数据表明，与DNA组装的颗粒具有30个碱基对表现出最强的ME耦合，这表明更充分地整合异质纳米复合材料和最弱的相互作用与18个碱基对的DNA。这些结果表明，DNA中较长的接头区是形成较好复合物的关键因素。这种结果可能是由于纳米颗粒的不规则形状。更长的DNA链将能够更好地桥接，产生更多的连接。较短的链也不能桥接不规则形状的颗粒，因此导致复合材料中的连接和较少的异质性。
Ferrite-ferroelectric core-shell nanoparticles were prepared by deoxyribonucleic acid (DNA) assisted self-assembly and the strained mediated magneto-electric (ME) interactions between the ferroic phases were studied. The nanoparticle type and size were varied and the DNA linker sequence was also varied. Two kinds of particles, one with 600 nm barium titanate (BTO) core and 200 nm nickel ferrite (NFO) shell and another with 200 nm BTO core and 50 nm nickel cobalt ferrite (NCFO) shell were prepared. The particles were linked by three different oligomeric DNA containing 19, 18 or 30 base pairs. The core–shell structure was evident from electron microscopy and scanning microwave microscopy images. Films and disks of the core-shell particles were assembled in a magnetic field and used for measurements of low frequency ME voltage coefficient (MEVC) and magnet-dielectric effect. The MEVC data on films indicate that particles assembled with DNA with 30 base pairs exhibit the strongest ME coupling suggesting a more fully integrated heterogenous nanocomposite and the weakest interaction for DNA with 18 base pairs. These results indicate that the longer linker region in DNA is the key factor for forming better composites. This result may be due to the irregular shape of the nanoparticles. Longer DNA strands would be able to bridge better generating more linkages. Shorter strands would not able to bridge the irregularly shaped particles as well and therefore result in linkages and less heterogeneity in the composites.
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影响因子：
0.7
作者：
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通讯作者：
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影响因子：
4
作者：
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通讯作者：
Srinivasan, G.
影响因子：
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作者：
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通讯作者：
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