Novel and green synthesis of high-fluorescent carbon dots originated from honey for sensing and imaging.
An innovative and green strategy to synthesize carbon dots (CDs) with a quantum yield (QY) of nearly 19.8% has been successfully established for the first time. Subsequently, the possible fluorescence (FL) mechanism was elucidated by fluorescence, UV-vis, high resolution transmission electron microscope (HR-TEM), Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) analyses. Significantly, not only the precursor of CDs and whole synthesis procedure was green, but also the CDs obtained here exhibited various advantages including high fluorescent QY, excellent photostability, non-toxicity and satisfactory stability. Additionally, the CDs were employed for assaying Fe(3+) based on direct interactions between Fe(3+) and − COOH, − OH and − NH2 of CDs, resulting in aggregations that facilitate to quench their fluorescence. The decrease of fluorescence intensity permitted detections of Fe(3+) in a linear range of 5.0 × 10(-9)-1.0 × 10(-4)mol/L, with a detection limit of 1.7 × 10(-9)mol/L at a signal-to-noise ratio of 3, suggesting a promising assay for Fe(3+). Eventually, the CDs were applied for cell imaging and coding, demonstrating their potential towards diverse applications.
College of Pharmaceutical Sciences, Southwest University, Chongqing 400716, China. Electronic address: xiaoming4444@gmail.com.
Xiaoming
X
Yang
College of Pharmaceutical Sciences, Southwest University, Chongqing 400716, China.
Yan
Y
Zhuo
College of Pharmaceutical Sciences, Southwest University, Chongqing 400716, China.
Shanshan
S
Zhu
College of Pharmaceutical Sciences, Southwest University, Chongqing 400716, China.
Yawen
Y
Luo
College of Pharmaceutical Sciences, Southwest University, Chongqing 400716, China.
Yuanjiao
Y
Feng
College of Pharmaceutical Sciences, Southwest University, Chongqing 400716, China.
Yao
Y
Dou
D015374:Biosensing Techniques / Q000379:methods*; D002244:Carbon / Q000032:analysis / Q000737:chemistry*; D003287:Contrast Media / Q000138:chemical synthesis; D005456:Fluorescent Dyes / Q000138:chemical synthesis*; D055772:Green Chemistry Technology; D006722:Honey; D007089:Image Enhancement / Q000379:methods; D008856:Microscopy, Fluorescence / Q000379:methods*; D013050:Spectrometry, Fluorescence / Q000379:methods*
D003287:Contrast Media; D005456:Fluorescent Dyes; D002244:Carbon
Bioimaging; Carbon dots; Green synthesis; Sensing