Photoluminescent detection of biological materials and ions by chemically modified carbon nano dots

2014 Fiscal Year Final Research Report

• Project/Area Number: 25810083
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Analytical chemistry
• Research Institution: Kanazawa University
• Principal Investigator: MORITA Kotaro 金沢大学, 物質化学系, 助教 (70396430)
• Project Period (FY): 2013-04-01 – 2015-03-31
• Keywords: カーボンナノドット / 発光センサー

Outline of Final Research Achievements

In this study, a photoluminescent detection method for nitrite with high selectivity and sensitivity using CNDs is demonstrated based on the chemical reactivity of CND itself. We have shown the CND to be a novel photoluminescent probe for nitrite based on the specific reaction via aryl radicals generated from p-phenylenediamine diazotized by the nitrite. In the present method, nitrite can be selectively detected down to 1 uM over several anions, such as nitrate, perchlorate, sulfate, fluoride, chloride, and bromide at mM levels. The photoactivity is also investigated by comparing six CNDs prepared from organic precursors having different elemental compositions. As a consequence, hetero atoms such as nitrogen and sulfur had a striking effect on the quantum yield. CND prepared from glutathione showed the quantum yield of 0.46. These results present evidence of the value of chemical modification of CNDs including the chemical reactivity of CND itself and hetero-atom doping.

Free Research Field

分析化学