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Silicon nanowires-based fluorescence sensor for Cu(II).

Lixuan Mu¹, Wensheng Shi, Jack C Chang

¹Laboratory of Organic Optoelectronic Functional Materials and Molecular Engineering, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100080, China.

|December 22, 2007

Summary

A novel optical sensor using silicon nanowires (SiNWs) covalently modified with a fluorescence ligand (QlOEt) offers highly sensitive and selective detection of copper(II) ions (Cu(II)). This reversible sensor demonstrates enhanced performance over the ligand alone and is extendable to other sensing applications.

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Area of Science:

Materials Science
Nanotechnology
Analytical Chemistry

Background:

Silicon nanowires (SiNWs) are promising nanomaterials for sensor development.
Developing selective and sensitive detection methods for metal ions like copper(II) (Cu(II)) is crucial in environmental and biological monitoring.
Fluorescence-based sensors offer high sensitivity for detecting analytes.

Purpose of the Study:

To develop a highly sensitive and selective optical sensor for Cu(II) detection.
To covalently modify SiNWs with a fluorescence ligand, N-(quinoline-8-yl)-2-(3-triethoxysilyl-propylamino)-acetamide (QlOEt).
To investigate the sensing mechanisms and performance enhancement of the modified SiNWs sensor.

Main Methods:

Covalent modification of SiNWs with the QlOEt fluorescence ligand.

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Fabrication of an optical sensor using the QlOEt-modified SiNWs.

Testing the sensitivity and selectivity of the sensor for Cu(II) detection.

Investigating the reversibility of the sensor response.

Main Results:

The QlOEt-modified SiNWs sensor achieved a sensitivity for Cu(II) down to 10(-8) M.
The modified SiNWs sensor exhibited higher sensitivity and selectivity for Cu(II) compared to QlOEt alone.
The sensor's performance was unaffected by common metal ion interferences.
The sensor demonstrated reversibility upon addition of acid to remove Cu(II).

Conclusions:

The QlOEt-modified SiNWs form a highly sensitive and selective optical sensor for Cu(II).
The SiNWs platform enhances the sensing capabilities of the QlOEt ligand.
The reversible nature and robustness of the sensor make it suitable for various applications.
The sensor design is adaptable for developing other chemo- and biosensors, including intracellular nanosensors.