Efficient light-driven particle capture actuator based on photo-thermal composite film

By using a fiber interference structure and a stacked design of graphene oxide/polydimethylsiloxane-gold nanobipyramidal composite film, the problems of low photothermal efficiency, unstable thermal field and complex preparation in photothermal driven particle manipulation are solved, realizing low power consumption, high efficiency particle capture and real-time sensing functions, which are suitable for the biomedical field.

CN121423055APending Publication Date: 2026-01-30GUILIN UNIV OF ELECTRONIC TECH
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Patent Information

Application Number
CN202511597452.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-11-04
Publication Date
2026-01-30

AI Technical Summary

Technical Problem

Existing photothermal-driven particle manipulation technologies suffer from problems such as the contradiction between photothermal conversion efficiency and cost, thermal field instability, fabrication complexity, and limited functionality, making it difficult to meet the practical application needs in fields such as biomedicine.

Method used

By employing a stacked design of fiber interference structure and graphene oxide/polydimethylsiloxane-gold nanobipyramidal composite film, particle trapping under low power is achieved through the synergistic effect of fiber optic FPI microcavity beam expansion light field and composite film photothermal effect, and real-time sensing function is integrated. The fabrication process does not require precision micro-nano fabrication equipment.

Benefits of technology

It achieves high and stable particle capture efficiency, adapts to various liquid environments, is suitable for microfluidic chips and bioreactors, meets the needs of live cell manipulation, and features low power consumption and a wide range of applications.

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Abstract

The invention discloses an efficient light-driven particle capture actuator based on a GO / PDMS-AuNBPs composite film, and belongs to the technical field of micro-nano control and biomedical engineering. The actuator aims at solving the problems that an existing light-driven particle capturing technology is low in photothermal conversion efficiency, depends on high-power laser, and is poor in thermal field stability and single in function. The core structure comprises a photo-thermal composite film and an optical fiber F-P sensing structure. The photo-thermal composite film is composed of a graphene oxide (GO) film and a polydimethylsiloxane (PDMS) film doped with gold nano bipyramid (AuNBPs). The optical fiber interference structure is formed by welding a single mode fiber (SMF) and a hollow fiber (HCF), and the end face of the HCF is coated with a photo-thermal composite film to construct a Fabry-Perot interference (FPI) microcavity; and the sensing unit realizes real-time monitoring of the capture state by monitoring the change of the reflection spectrum of the FPI microcavity. During working, the FPI microcavity plays a role in expanding a beam of a light field so as to improve the light field utilization rate of the GO film. PDMS regulation and control form an axisymmetric temperature potential well, and Marangoni force caused by temperature gradient drives particle capture. The lowest excitation power of the actuator is 11.9 mW, particles of 5-400 microns can be captured, and the actuator has low power consumption, high stability and biological compatibility and is suitable for living cell control, micro-reactor construction and micro-fluidic chip integration.
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