Cellulose nanocrystals （CNCs）, a unique and promising natural material extracted from native cellulose, have attracted considerable attention owing to their physical properties and special surface chemistry. This...Cellulose nanocrystals （CNCs）, a unique and promising natural material extracted from native cellulose, have attracted considerable attention owing to their physical properties and special surface chemistry. This review focuses on chemical conjugation strategies that can be used for preparation of ？uorescent-molecule labeled CNCs and the development of biomaterials. Furthermore, their application in the detection of metal ions and future development prospects are discussed. We hope to provide a clear view of the strategies for surface fluorescent modifcation of CNCs and their application in detection of metal ions.展开更多
In recent years,carbon quantum dots(CQDs)have been of great enthrallment in the fluorescent probe field.Carbon precursors with interesting physicochemical properties may be derived from natural sources.In this researc...In recent years,carbon quantum dots(CQDs)have been of great enthrallment in the fluorescent probe field.Carbon precursors with interesting physicochemical properties may be derived from natural sources.In this research,for the first time,coconut water has been used as a source of carbon to prepare blue fluorescent CQDs without any modification and functionalization.The preparation of CQDs is very simple and cost-effective,when compared with other conventional techniques.The reaction parameters temperature and pH were varied to obtain monodispersed spherical CQDs with an average grain size of ∼5 nm.The CQDs exhibit blue emission with a wavelength of 487 nm with an excitation wavelength of 390 nm and are used for Fe^(3+) ions detection.Fe^(3+) ions have been observed to quench the fluorescence intensity of the CQDs than other heavy metals.In the presence of Fe^(3+) ions,the fluorescent CQDs are quenched due to the interaction of CQDs and Fe^(3+) ions.A spectroscopic result shows that Fe^(3+) ions can be observed within a concentration of 0-700μM,as well as the detection limit is 0.30μM.The CQDs provide a unique pathway for potential application in the environmental monitoring of heavy metal ions.展开更多
基金the National Natural Science Foundation of China (51373131)Fundamental Research Funds for the Central Universities (XDJK2016A017 and XDJK2016C033 )+1 种基金Project of Basic Science and Advanced Technology Research, Chongqing Science and Technology Commission (cstc2016, jcyjA0796)the Talent Project of Southwest University (SWU115034)
文摘Cellulose nanocrystals （CNCs）, a unique and promising natural material extracted from native cellulose, have attracted considerable attention owing to their physical properties and special surface chemistry. This review focuses on chemical conjugation strategies that can be used for preparation of ？uorescent-molecule labeled CNCs and the development of biomaterials. Furthermore, their application in the detection of metal ions and future development prospects are discussed. We hope to provide a clear view of the strategies for surface fluorescent modifcation of CNCs and their application in detection of metal ions.
文摘In recent years,carbon quantum dots(CQDs)have been of great enthrallment in the fluorescent probe field.Carbon precursors with interesting physicochemical properties may be derived from natural sources.In this research,for the first time,coconut water has been used as a source of carbon to prepare blue fluorescent CQDs without any modification and functionalization.The preparation of CQDs is very simple and cost-effective,when compared with other conventional techniques.The reaction parameters temperature and pH were varied to obtain monodispersed spherical CQDs with an average grain size of ∼5 nm.The CQDs exhibit blue emission with a wavelength of 487 nm with an excitation wavelength of 390 nm and are used for Fe^(3+) ions detection.Fe^(3+) ions have been observed to quench the fluorescence intensity of the CQDs than other heavy metals.In the presence of Fe^(3+) ions,the fluorescent CQDs are quenched due to the interaction of CQDs and Fe^(3+) ions.A spectroscopic result shows that Fe^(3+) ions can be observed within a concentration of 0-700μM,as well as the detection limit is 0.30μM.The CQDs provide a unique pathway for potential application in the environmental monitoring of heavy metal ions.
