Abstract
Highly photoluminescent (PL) CuInZn xS 1+x nanocrystals (NCs) and CuInZn xS 1+x/ZnS core/shell NCs were successfully synthesized by a facile colloidal method. First, a facile and reliable non-injection method for the synthesis of photoluminescent CuInZn xS 2+x NCs was developed with inexpensive reagents. The relative PL quantum yields (QYs) of CuInZn xS 2+x NCs could reach up to 30%, with tunable emissions in the range 580-780 nm. Then, CuInZn xS 2+x/ZnS core/shell NCs were synthesized and showed greatly improved optical properties, the PL QY of the CuInZn xS 2+x/ZnS NCs can reach up to 60%. Even in the near-infrared region, the PL QY still can achieve up to 45% due to the successful controlled red shift of PL during the ZnS shell growth process. More importantly, such core/shell NCs can be transferred into water successfully using amphiphilic oligomer (polymaleic acid n-hexadecanol ester) as a surface coating agent by an organic-aqueous phase transfer method and the PL QYs can be well controlled over 40%. Furthermore, a biosensor system (lateral flow immunoassays system, LFIA) for the detection of C-reactive protein (CRP) was developed by using this water-soluble CuInZn xS 2+x/ZnS core/shell NCs as fluorescent label and a nitrocellulose filter membrane for lateral flow. The results showed that such CuInZn xS 2+x/ZnS core/shell NCs were excellent fluorescent labels to detect CRP. The detection sensitivity for CRP could reach 1 ng mL -1.
Original language | English (US) |
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Pages (from-to) | 18623-18630 |
Number of pages | 8 |
Journal | Journal of Materials Chemistry |
Volume | 22 |
Issue number | 35 |
DOIs | |
State | Published - Sep 21 2012 |
ASJC Scopus subject areas
- General Chemistry
- Materials Chemistry