Benzoyl Halide as Alternative Precursor for Synthesis of Lead Free Double Perovskite Cs<sub>3</sub>Bi<sub>2</sub>Br<sub>9</sub> Nanocrystals
作者:Ashish Kumar、S. S. Rawat、Sanjay Kumar Swami、Vidya Nand Singh、Ritu Srivastava
DOI:10.1166/jnn.2020.17495
日期:2020.6.1
Ternary bismuth halides are interesting functional materials closely related to Pb halideperovskite photovoltaic material, and are widely sought after due to reduced toxicity of Bi compared to Pb. There are several reports on synthesis of Cs₃Bi₂Br9 nanocrystals (NCs) due to its being relatively stable compared to leadperovskite. Cs₃Bi₂Br9 nanocrystals have been synthesised using benzoyl bromide as
三元卤化铋是与Pb卤化物钙钛矿光伏材料密切相关的有趣功能材料,由于Bi与Pb相比毒性降低,因此受到广泛追捧。关于Cs₃Bi2 Br9纳米晶体(NCs)的合成,有几篇报道,因为它与钙钛矿铅相比相对稳定。Cs 14 Bi 2 Br 9纳米晶体是使用苯甲酰溴作为前体,通过热注射工艺在120℃和160℃这两个不同的温度下合成的。使用X射线衍射,(XRD)UV-Vis光谱,高分辨率透射电子显微镜和光致发光光谱对样品的结构,光学,微结构和发光特性进行了表征。XRD表明形成具有单晶结构的Cs₃Bi2 Br9相。UV-Vis在可见光区域显示出两种类型的带隙,这表明该材料可用于光伏应用。HRTEM将颗粒限制为由纳米晶体组成,在120°C的样品中,纳米颗粒的粒径约为5 nm,并且颗粒结合在一起会产生由纳米颗粒组成的各种结构。时间分辨的光致发光显示在两个不同温度下生长的样品的平均寿命为3.067 ns和4.761
Solution-Based Synthesis of Layered Intergrowth Compounds of the Homologous Pb<sub><i>m</i></sub>Bi<sub>2<i>n</i></sub>Te<sub>3<i>n</i>+<i>m</i></sub>Series as Nanosheets
作者:Arindom Chatterjee、Kanishka Biswas
DOI:10.1002/anie.201500281
日期:2015.5.4
Layered intergrowth compounds in the homologous PbmBi2nTe3n+m family are interesting because they are examples of natural heterostructures. We present a simple solution‐based synthesis of two‐dimensional nanosheets of PbBi2Te4, Pb2Bi2Te5, and PbBi6Te10 layered intergrowth compounds, which are members of the PbmBi2nTe3n+m [that is, (PbTe)m(Bi2Te3)n] homologousseries. Few‐layer nanosheets exhibit narrow
同源的Pb m Bi 2 n Te 3 n + m家族中的层状共生化合物很有趣,因为它们是天然异质结构的实例。我们提出了一个简单的基于溶液的二维合成的PbBi 2 Te 4,Pb 2 Bi 2 Te 5和PbBi 6 Te 10层状共生化合物纳米片,它们是Pb m Bi 2 n Te 3 n + m的成员[即(PbTe)m(Bi 2 Te3)n ]同源序列。几层纳米片表现出窄的光学带隙(0.25-0.7 eV),具有半导体电子传输特性。
Synthetic Nanosheets of Natural van der Waals Heterostructures
作者:Ananya Banik、Kanishka Biswas
DOI:10.1002/anie.201708293
日期:2017.11.13
Mixed sheets: A simple solution based synthesis allows the formation of 2D ultrathin heterostructurednanosheets of layered intergrowth compounds SnBi4Te7 and SnBi6Te10, which belong to the SnmBi2nTe3n+m homologous series. The few-layer nanosheets exhibit ultralow lattice thermal conductivity and semiconducting electron-transport properties with high carrier mobility.
混合片:简单的基于溶液的合成方法可以形成层状共生化合物SnBi 4 Te 7和SnBi 6 Te 10的二维超薄异质纳米片,它们属于Sn m Bi 2 n Te 3 n + m同源系列。几层纳米片表现出超低的晶格热导率和具有高载流子迁移率的半导体电子传输特性。
Nanoscale Stabilization of Nonequilibrium Rock Salt BiAgSeS: Colloidal Synthesis and Temperature Driven Unusual Phase Transition
作者:Satya N. Guin、Swastika Banerjee、Dirtha Sanyal、Swapan K. Pati、Kanishka Biswas
DOI:10.1021/acs.chemmater.7b00862
日期:2017.4.25
demonstrate the entrapping of nonequilibrium rock salt phase of BiAgSeS in the nanocrystalline form at room temperature via kinetic colloidal synthesis. High symmetry rock salt nanocrystals undergo an unusual irreversible phase transition to a lower symmetry thermodynamic trigonal structure upon thermal treatment. To get fundamental insights into such unusual finding, we have performed temperature dependent
would be critical to grow metal nanostructures with high purities and the desired stoichiometries. A metal‐redox strategy that employs spontaneous oxidation/reduction reactions to grow nanocrystalline alloys using molecular‐scale zerovalent metal precursors is now described. The selection of suitable zerovalent metal species allows for thermodynamic control of the compositional stoichiometry during the