Self-assembled interface film-driven reverse microemulsion method without traditional amphiphilic surfactants for preparation of highly stable QD@SiO₂

ZENG Zhicong; XIE Yingying; CHEN Jiefeng; JIN Lei; ZHANG Zhikuan

doi:10.37188/CJLCD.2026-0086

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Self-assembled interface film-driven reverse microemulsion method without traditional amphiphilic surfactants for preparation of highly stable QD@SiO₂

Material Physics | 更新时间：2026-09-12

- Self-assembled interface film-driven reverse microemulsion method without traditional amphiphilic surfactants for preparation of highly stable QD@SiO₂
- Chinese Journal of Liquid Crystals and Displays Vol. 41, Issue 7, Pages: 932-941(2026)
- 作者机构：
  
  深圳扑浪创新科技有限公司，广东深圳 518115
- 作者简介：
- 基金信息：
  
  Shenzhen Science and Technology Program Key Industry RD Plan(ZDCY20250901095902003)
- DOI：10.37188/CJLCD.2026-0086
  CLC： O482.31
- CSTR：32172.14.CJLCD.2026-0086
- Received：15 May 2026，
  
  Revised：2026-06-12，
  
  Published：06 July 2026
- 稿件说明：
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ZENG Zhicong, XIE Yingying, CHEN Jiefeng, et al. Self-assembled interface film-driven reverse microemulsion method without traditional amphiphilic surfactants for preparation of highly stable QD@SiO₂[J]. Chinese Journal of Liquid Crystals and Displays, 2026, 41(7): 932-941.
DOI：

ZENG Zhicong, XIE Yingying, CHEN Jiefeng, et al. Self-assembled interface film-driven reverse microemulsion method without traditional amphiphilic surfactants for preparation of highly stable QD@SiO₂[J]. Chinese Journal of Liquid Crystals and Displays, 2026, 41(7): 932-941. DOI： 10.37188/CJLCD.2026-0086. CSTR： 32172.14.CJLCD.2026-0086.

摘要

量子点（QDs）的高效二氧化硅包覆长期受困于传统表面活性剂而引发荧光淬灭，其根本原因在于传统表面活性剂的极性头基（聚氧乙烯链、羟基等）具有配位能力，会与量子点的Zn、Cd等金属原子结合，抢占原始配体的配位位点（如油酸），从而导致量子点的配体脱落和表面缺陷态形成。本文提出一种“无皂”反向微乳液法，彻底摒弃传统两亲性表面活性剂，利用异戊醇/乙二醇双助剂在油水界面的自组装行为形成稳定界面膜，构建无传统两亲性表面活性剂的纳米反应器，成功实现了CdSe/ZnS量子点的高效二氧化硅包覆。系统研究表明，该方法制备的QD@SiO

复合材料光致发光量子产率（PLQY）保持在78.7%~80.6%，远高于传统TritonX-100方法的26%。透射电子显微镜显示，SiO

壳层厚度均匀（14.7 nm）、颗粒分散性优良。以初始功率（1.0 mW，

=0）为基准，抗蓝光老化测试250 h后，绿光功率保持率达93%，显著优于传统方法的55%。本研究从界面热力学和动力学角度阐明了无传统两亲性表面活性剂纳米反应器的形成机制及其对量子点光学性能的保护机理，为高亮度、长寿命量子点复合材料的可控合成提供了新路径。

Abstract

The efficient silica coating of quantum dots（QDs） has long been hindered by the fluorescence quenching problem caused by traditional surfactants. The fundamental reason lies in the competitive adsorption of the hydrophobic chains of surfactants and the surface ligands of QDs， resulting in ligand detachment and the formation of surface defect states. This paper proposes a “soap-free” reverse microemulsion method（Surfactant-Free Reverse Microemulsion， SFRM）， completely eliminating traditional amphiphilic surfactants and using isopropanol/ethylene glycol as dual cosolvents to form a stable interface film at the oil-water interface. A nano-reactor without traditional amphiphilic surfactants is constructed， successfully achieving efficient silica coating of CdSe/ZnS quantum dots. Systematic studies show that the photoluminescence quantum yield（PLQY） of QD@SiO

composites remains at 78.7%~80.6% （average 79.6±0.78%）， which is much higher than 26% of the traditional Triton X-100 method. Transmission electron microscopy（TEM） shows that the thickness of

the SiO

shell layer is uniform（14.7 nm） and the particle dispersion is excellent. Based on the initial power（1.0 mW at

=0）， the green light power retention rate after 250 h anti-blue light aging test is 93%， significantly better than 55% of the traditional method. This study clarifies the formation mechanism of the nano-reactor without traditional amphiphilic surfactants from the perspective of interface thermodynamics and kinetics， and the protection mechanism of the optical properties of quantum dots. It provides a new path for the controllable synthesis of high-brightness and long-life quantum dot composite materials.

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School of Physical Science and Engineering， Beijing Jiaotong University

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