微接触印刷法制备高有序荧光CdSe量子点阵列

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"《高度有序的荧光CdSe量子点阵列》这篇首发论文由张莉、司华艳等人合作完成，他们来自兰州大学应用有机化学国家重点实验室和兰州物理研究所表面工程国家重点实验室。研究团队利用微接触印刷（μCP）技术，实现了对化学图案化底材的精细控制。这种方法的关键在于制作具有交替亲水性和疏水性方形图案的底板，这些图案引导水滴在亲水区域形成二维模板。通过将CdSe量子点（QDs）在这些液-液界面进行自组装，研究人员成功地制备出高度有序的量子点环或点状结构。这种阵列的形状和大小可以根据水和有机溶剂的相对蒸发速率进行调控，从而实现对纳米结构的高度定制。这种精确的控制使得所得到的量子点阵列不仅在形貌上高度有序，而且在光学性能上展现出均匀的荧光特性。这种阵列的设计具有重要的应用前景，例如在光电子学、生物传感器、光催化和纳米药物递送等领域。理想的表面形貌有助于提高材料的稳定性和功能性，尤其是在与液体环境交互时，避免了常见的团聚问题。通过微调自组装过程中的参数，研究人员可以进一步优化量子点的性能，以满足不同应用的需求。该研究展示了微接触印刷技术在制备高度有序荧光量子点阵列中的潜力，为未来在纳米材料设计和集成应用方面提供了新的思路和方法。这项工作不仅推动了量子点自组装科学的发展，也为相关领域的前沿研究和实际应用奠定了坚实的基础。"

Highly Ordered and fluorescent CdSe Quantum Dots Arrays

Li Zhang

, Hua-Yan Si

, Hua Xu

, Hao-Li Zhang

, Yu-Qing Xiong

State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical

Engineering, Lanzhou University, Lanzhou, 730000, China

National Key Lab of Surface Engineering, Lanzhou Institute of Physics, Lanzhou, 730000, China

Email: Haoli.Zhang@lzu.edu.cn

Highly ordered arrays consisting uniform fluorescent cadmium selenide (CdSe)

quantum dots (QDs) ring or dot structures were obtained by self-assembly of QDs on

chemically patterned substrates. In this method, Au substrates with alternative

hydrophobic and hydrophilic square patterns are firstly fabricated by microcontact

printing (μCP), which allows water droplets to condense on the hydrophilic regions to

provide two-dimensional template arrays. The CdSe QDs are then assembled at the

liquid/liquid interfaces to give uniform micro- or nanostructures. The shape and size

of the ring and dots can be tailored by controlling the relative evaporation speed of the

water and the organic solvents. The obtained nanostructures have ideal topography to

avoid substrate-induced fluorescence quenching.

Keywords: Microcontact printing; CdSe, quantum dots; Micro-arrays

1. Introduction

Patterning of functional materials into two-dimensional arrays is very important for

many photonic and electronic applications, such as multiple color light emitting

diodes (LEDs), field-emission displays, and multichannel chemical sensors. Therefore,

the schemes of positioning functional materials in predetermined areas are of great

scientific and technological interest.

Highly fluorescent cadmium selenide (CdSe)

quantum dots (QDs) is currently of great interest due to their unique size-dependent

optical properties,

and wide applications in bioimaging,

LEDs, and many photonic

and optoelectronic devices.

Various methods have been applied in order to

manipulate the organizational geometry of QDs, including photolithography,

selective dewetting,

capillary organization

and selective photoactivation.

However,

the controlled deposition of nanoparticles onto specific regions of surfaces with high

selectivity and easy operation still poses a significant challenge.

Microcontact printing (µCP) has been extensively applied in micro- and

nanostructure fabrications due to many advantages including fast, simple, inexpensive

operation, adaptable to large areas, and suitable for arbitrary surfaces. Since µCP is

based on a pattern transfer from topographic featured PDMS stamp to substrate via

conformal contact, the patterning resolution of is normally restricted by the feature

size on the stamp. However, by combining with other techniques, much higher

resolution could be obtained.

In this work, a method combining µCP with

self-assembly of nanoparticles at liquid/liquid interface is applied to produce highly

ordered array patterns with feature size smaller than that on the stamps. In this method,

µCP is used to create chemical patterns on substrates, which induce selective

condensation of water droplets. Then the QDs are assembled to the liquid/liquid

interface

to produce uniform ring or dot structures that are much smaller than the

chemical patterns. This method represents a simple, convenient, and versatile

approach for fabricating arrays of CdSe QDs aggregates of various patterns without

the aid of advanced lithographical tools.

http://www.paper.edu.cn

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微接触印刷法制备高有序荧光CdSe量子点阵列

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