Crystalline AuNP-Decorated Strontium Niobate Thin Films: Strain-Controlled AuNP Morphologies and Optical Properties for Plasmonic Applications.
Crystalline AuNP-Decorated Strontium Niobate Thin Films: Strain-Controlled AuNP Morphologies and Optical Properties for Plasmonic Applications.
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DOI：
10.1021/acsanm.3c00934
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发表时间：
2023-07-14
影响因子：
5.9
通讯作者：
Petrov, Peter K. K.
中科院分区：
文献类型：
--
作者：
Yao, Qiaomu;Berenov, Andrey V. V.;Bower, Ryan;Zou, Bin;Xiao, Xiaofei;Alford, Neil M. M.;Oulton, Rupert F. M.;Petrov, Peter K. K.
关键词：
金纳米粒子（AuNP）修饰是一种常用的方法，可以提高样品的光学响应，如荧光、生物传感、太阳能电池等。AuNP的形貌和结构是决定样品功能的重要因素。然而，在相同的表面上定制AuNP的生长机制并不简单。在这项研究中，金纳米颗粒沉积在钙钛矿薄膜，钛酸锶（SNO）的表面上，使用脉冲激光沉积（PLD）。金纳米粒子的生长机制表现出显着的变化，这取决于它们是否沉积在氧化镁（SNO/MgO）或钛酸锶（SNO/STO）衬底上生长的SNO薄膜。在SNO/MgO上，Au聚集体形成平均尺寸高达3500 nm 2的大NP。这些AuNP是具有尖锐边缘和拐角的三角形。生长的面外方向是有利的，并且AuNPs的表面覆盖率低。当沉积在SNO/STO上时，AuNP的平均尺寸小得多，即，约250 nm 2。这种平均尺寸的减小伴随着NP的数量密度的增加。SNO/STO上的AuNPs具有圆形形状和高覆盖率。当夹层SNO膜的厚度低于80 nm时，衬底选择对AuNP结构的这种影响是显著的，并且对于200 nm的SNO膜，这种影响被削弱。采用X射线衍射（XRD）和扫描电子显微镜（SEM）对样品进行了表征。应变分析被用来解释金纳米粒子的生长机制。通过使用原子力显微镜（AFM）测量AuNPs的平均高度。在可见-近红外（vis-NIR）区域的椭圆偏振法被用来表征所有样品的光学响应。AuNP修饰的SNO/MgO和SNO/STO薄膜表现出不同的光学性质，只有金修饰的SNO/MgO样品显示出纳米颗粒的尺寸依赖性ε近零行为。这些结果提供了控制AuNPs结构的额外途径。它们可用于各种等离子体应用，如设计和开发用于表面增强拉曼光谱（SERS）和拉曼光谱的应变工程金纳米颗粒装饰设备。
Gold nanoparticle (AuNP) decoration is a commonly used method to enhance the optical responses in many applications such as photocatalysis, biosensing, solar cells, etc. The morphology and structure of AuNPs are essential factors determining the functionality of the sample. However, tailoring the growth mechanism of AuNPs on an identical surface is not straightforward. In this study, AuNPs were deposited on the surface of a perovskite thin film, strontium niobate (SNO), using pulsed laser deposition (PLD). AuNPs exhibited a dramatic variation in their growth mechanisms, depending on whether they were deposited on SNO thin films grown on magnesium oxide (SNO/MgO) or strontium titanate (SNO/STO) substrates. On SNO/MgO, the Au aggregates form large NPs with an average size of up to 3500 nm2. These AuNPs are triangular with sharp edges and corners. The out-of-plane direction of growth is favored, and the surface coverage ratio by AuNPs is low. When deposited on SNO/STO, the average size of AuNPs is much smaller, i.e., ∼250 nm2. This reduction in the average size is accompanied by an increase in the number density of NPs. AuNPs on SNO/STO have a round shape and high coverage ratio. Such an impact from the substrate selection on the AuNP structure is significant when the sandwiched SNO film is below 80 nm thickness and is weakened for 200 nm of SNO films. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to characterize all samples. Strain analysis was used to explain the growth mechanism of AuNPs. The average height of AuNPs was measured by using atomic force microscopy (AFM). Ellipsometry in the visible–near-infrared (vis–NIR) region was used to characterize the optical response of all samples. AuNP-decorated SNO/MgO and SNO/STO thin films exhibit different optical properties, with only gold-decorated SNO/MgO samples showing a size-dependent epsilon-near-zero behavior of nanoparticles. These results provide an additional route to control the structure of AuNPs. They can be used for various plasmonic applications like the design and development of strain-engineered gold-nanoparticle-decorated devices for surface-enhanced Raman spectroscopy (SERS) and photocatalysis.
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影响因子：
3.7
作者：
Vailionis, A.;Boschker, H.;Koster, G.
通讯作者：
Koster, G.
影响因子：
6.7
作者：
Chuang, Ming-Kai;Lin, Shih-Wei;Hsu, Chain-Shu
通讯作者：
Hsu, Chain-Shu
影响因子：
3.4
作者：
Liu, G;Nan, CW
通讯作者：
Nan, CW
DOI：
10.1016/s0921-5093(00)00846-7
发表时间：
2000-09-15
影响因子：
6.4
作者：
Petrov, PK;Ivanov, ZG;Gevorgyan, SS
通讯作者：
Gevorgyan, SS
影响因子：
4
作者：
Peng, LSJ;Xi, XX;Alpay, SP
通讯作者：
Alpay, SP