光学性质可调的 Bi2S3 纳米粒子的选择性各向异性生长,Physical Chemistry Chemical Physics

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光学性质可调的 Bi2S3 纳米粒子的选择性各向异性生长
Physical Chemistry Chemical Physics ( IF 2.9 ) Pub Date : 2022-12-20 , DOI: 10.1039/d2cp05437j
Mariona Escoda-Torroella _{1,

2} , Carlos Moya _{1,

2} , José A Ruiz-Torres _{1,

2} , Arantxa Fraile Rodríguez _{1,

2} , Amílcar Labarta _{1,

2} , Xavier Batlle _{1,

2}

Affiliation

我们报告了通过两个步骤控制合成和功能化各种尺寸的细长 Bi ₂ S _{3纳米粒子。}首先，我们展示了温度和反应时间对硫代乙酰胺与新癸酸铋 ( III ) 在有机表面活性剂存在下的反应合成两个系列纳米粒子的影响。在 105 °C 和较长的反应时间下，获得了长度约为 45 nm 的纳米针，其中包含较大的微晶，而在 165 °C 时，长度约为 30 nm 的高度结晶纳米棒占主导地位，与反应时间无关。_{与块状 Bi 2} S ₃相比，两种类型的纳米颗粒的光学特性都显示出带隙的增强. 这可能是由于相对于典型激子尺寸的小粒子尺寸引起的量子限制效应，以及由于各向异性粒子形状导致的近红外吸收增加。其次，开发了一种配体交换方法，通过将二巯基琥珀酸接枝到颗粒表面，将 Bi ₂ S ₃纳米颗粒转移到水溶液中。所制备的涂层纳米粒子在水中、广泛的生物 pH 范围和磷酸盐缓冲盐溶液中表现出良好的稳定性。_{总体而言，这项工作突出了细长 Bi 2} S ₃从无机核到有机表面涂层的各个层面的受控设计纳米粒子，通过调整它们的形态和大小导致可调谐的光学响应。

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Selective anisotropic growth of Bi2S3 nanoparticles with adjustable optical properties

We report on the controlled synthesis and functionalization in two steps of elongated Bi₂S₃ nanoparticles within a wide range of sizes. First, we show the effect of the temperature and reaction time on the synthesis of two series of nanoparticles by the reaction of thioacetamide with bismuth(III) neodecanoate in the presence of organic surfactants. At 105 °C and long reaction times, nanoneedles of about 45 nm in length containing larger crystallites are obtained, while highly crystalline nanorods of about 30 nm in length are dominant at 165 °C, regardless of the reaction time. The optical properties of both types of nanoparticles show an enhancement of the band gap compared to bulk Bi₂S₃. This is likely to arise from quantum confinement effects caused by the small particle dimensions relative to the typical exciton size, together with an increase in near-infrared absorption due to the anisotropic particle shape. Second, a ligand exchange approach has been developed to transfer the Bi₂S₃ nanoparticles to aqueous solutions by grafting dimercaptosuccinic acid onto the surface of the particles. The as-prepared coated nanoparticles show good stability in water, in a wide biological pH range, and in phosphate-buffered saline solutions. Overall, this work highlights the controlled design at all levels – from the inorganic core to the organic surface coating – of elongated Bi₂S₃ nanoparticles, leading to a tunable optical response by tuning their morphology and size.

更新日期：2022-12-20

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