A quantum dot-spore nanocomposite pH sensor

• QD@Spore nanocomposites are synthesized as a pH sensor.
• These nanocomposites are sensitive to pH in a broad range of 5.0–10.0.
• The possible mechanism and stability of nanocomposites are investigated in detail.
• The developed sensors have been applied for pH estimation of real samples.

A new quantum dot (QD)-based pH sensor design is investigated. The sensor is synthesized based on the self-assembly of green QDs onto treated spores to form QD@spore nanocomposites. The nanocomposites are characterized using laser scanning confocal microscopy, transmission electron microscope, and fluorescence spectroscopy, among others. Fluorescence measurements showed that these nanocomposites are sensitive to pH in a broad pH range of 5.0–10.0. The developed pH sensors have been satisfactorily applied for pH estimation of real samples and are comparable with those of the commercial assay method, indicating the potential practical application of the pH sensors.

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