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Defect-assisted, spray-printed colloidal quantum dot microlasers for biosensing.

Wei Zhang, Lei Wan, Yiqiu Wei

|October 1, 2022

Summary

This summary is machine-generated.

Spray-printed colloidal quantum dot microlasers offer a new prototype for high-performance, low-cost on-chip biosensors. These tiny, efficient devices show great promise for sensitive detection of biological molecules like glucose.

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Area of Science:

Materials Science
Nanotechnology
Biomedical Engineering

Background:

Colloidal quantum dots (CQDs) offer tunable optical properties for advanced photonic devices.
Microlasers are crucial components for miniaturized optical sensing systems.
Developing cost-effective and efficient fabrication methods for CQD microlasers is essential for practical applications.

Purpose of the Study:

To implement spectrally distinguishable CdSe-ZnS core-shell CQD microlasers using spray printing.
To characterize the optical properties of these printed microlasers.
To demonstrate their potential for sensitive biosensing applications.

Main Methods:

Spray printing of CdSe-ZnS core-shell CQDs to create microring lasers.
Systematic characterization of optical properties, including excitation thresholds and size dependence.
Application in refractive index sensing for glucose detection and biosensing of glucose and bovine serum albumin (BSA).

Main Results:

Successful fabrication of CQD microlasers with diameters down to 30 µm, significantly smaller than inkjet-printed counterparts.
Demonstrated detection sensitivity of 4.54 nm/min/refractive index unit in glucose sensing.
Validated biosensing capabilities for glucose and BSA solutions using defect-assisted printed microlasers.

Conclusions:

Spray printing is an efficient and simple technique for producing high-performance CQD microlasers.
These microlasers serve as a novel prototype for low-cost, on-chip microcavity sensors.
The developed technology holds significant potential for advancing biosensing platforms.