Journal
ANALYTICAL CHEMISTRY
Volume 89, Issue 2, Pages 1346-1352Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.analchem.6b04407
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Funding
- Natural Science Foundation of China [21275027, 21235001, 21475017]
- Fundamental Research Funds for the Central Universities [N140505003, N130105002, N150502001, N141008001]
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The rapid and accurate detection of hydrogen sulfide is of great concern due to its unique role on environmental pollution and signal transmission in physiological systems. Herein, we report a smart colorimetric probe for the selective detection of H2S. The probe is prepared via a surfactant-free route with cross-linked polyhedral oligomeric silsesquioxane (POSS) polymer cage as capping ligand and reducing agent under microwave irradiation, called poly-POSS-formaldehyde polymer (PPF) cage-AgNPs or PPF-AgNPs for short. The caged silver nanoparticles are well-dispersed with narrow size distribution within 6.0-8.4 nm. Chloride ions and aldehyde groups in PPF make the nucleation and growth of Ag nanoparticles accomplished within a very short time of 1 min. The positively charged PPF-AgNPs exhibit excellent selectivity to H2S against other anionic species and thiols due to the specific Ag-H2S interaction, where the favorable protection effect of PPF polymer cage from the nanoparticle aggregation is demonstrated. The colorimetric probe presents a quick response to H2S (<3 min) and favorable sensitivity within a linear range of 0.7-10 mu M along with a detection limit of 0.2 mu M. The probe is well demonstrated by analysis of H2S in various water and biological samples.
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