Multipurpose sensing applications of biocompatible radish-derived carbon dots as Cu2+ and acetic acid vapor sensors.
A recent trend in the preparation of carbon dots, optically unique nanomaterials, revolves around the use of readily-available, low-cost natural resources as precursors and their multipurpose applications. In this work, a hydrothermal method for preparing biocompatible carbon dots from radish was developed. The carbon dots were then tested for sensing of Cu2+ and acetic acid vapor. The carbon dots exhibited blue emission under UV illumination with, a quantum yield of 15%. The fluorescence emission was selectively quenched when Cu2+ ions were added, giving a detection limit of 0.16 μM. A paper-based fluorescent sensor was fabricated and shown to sense Cu2+ with a limit of detection of 6.8 μM. The carbon dots were able to determine the Cu2+ concentration in real water samples, with excellent recovery and reliability. The carbon dots were also used as the sensing material in an optical electronic nose, and tested for real-time detection of acetic acid vapor. Using principal component analysis, different ratios of acetic acid to methanol in solution were successfully identified with a detection limit of 15.5%. The acetic acid concentration in a real vinegar sample was also accurately determined. Our results demonstrated that label-free carbon dots derived from readily available radish can be simply used as versatile probes, giving them potential uses in multipurpose sensing applications.
['Praneerad|Janjira|J|', 'Thongsai|Nichaphat|N|', 'Supchocksoonthorn|Preeyanuch|P|', 'Kladsomboon|Sumana|S|', 'Paoprasert|Peerasak|P|']
D019342:Acetic Acid D001672:Biocompatible Materials D002244:Carbon D003300:Copper D062609:Electronic Nose D005504:Food Analysis D005740:Gases D057230:Limit of Detection D010209:Paper D025341:Principal Component Analysis D045663:Quantum Dots D031224:Raphanus D012680:Sensitivity and Specificity D018675:Toxicity Tests D014466:Ultraviolet Rays D014867:Water
Carbon dots Vapor sensor Hydrothermal Radish Cu(2+) sensor