Size-tunable copper nanocluster aggregates and their application in hydrogen sulfide sensing on paper-based devices
Date Issued
2016
Date
2016
Author(s)
Li, Yu-Chi
Abstract
An one-pot approach has been developed to control the size of penicillamine-copper nanocluster (PA-Cu NC) aggregates through the addition of different concentrations of polystyrene sulfonate (PSS). The PSS-PA-Cu NC aggregates are photoluminescent and have excellent water dispersity, better photostability under UV irradiation, and remarkable sensitivity towards H2S (limit of detection: 650 nM) compared to PA-Cu NC aggregates without PSS dispersion. The practicability of this probe was verified by determination of the H2S concentration in hot spring-water samples. The PSS-PA-Cu NCs were integrated into a portable microfluidic paper-based analytical device (μPAD) for the on/off determination of H2S in hot spring-water samples. This platform targets released H2S gas to avoid interference from other ions in water samples in contrast with conventional H2S detection methods which can only determine H2S directly from solution. The PSS-PA-Cu NC/μPADs use ultra-low sample volumes (5 μL) and feature shorter analysis times (~30 min) compared to conventional solution-based methods. The quantitative results not only can be seen by the naked-eye, as well as facilely recorded and transmitted using a smartphone but also can determined by microplate reader. The LOD of the PSS-PA-Cu NC/μPAD device was 1 μM. In conclusion the PSS-PA-Cu NC/μPADs have great potential to monitor H2S levels in gaseous and liquid samples.
Subjects
copper nanoclusters aggregates
hydrogen sulfide
paper-based devices
polyelectrolyte
Type
thesis
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