scholarly journals The Inherent Relationship between Carbon Nanodots and Carbon Source in the Determination of Metal Ions

2021 ◽  
Author(s):  
Manling Chen ◽  
Xue Liu
Keyword(s):  
Binding Energy ◽  
Carbon Source ◽  
Metal Ions ◽  
Microwave Heating ◽  
Carbon Nanodots ◽  
Ion Binding ◽  
Heating Method ◽  
Response Sensitivity ◽  
Binding Capability

Abstract Carbon nanodots (CDs) have exhibited excellent sensing capability for various metal ions. However, it is difficult to determine the selectivity of CDs to metal ions. In this work, we chose appropriate carbon source to design CD sensors against Cu(II) and Ag(I). Glycine, histidine and leucine have been confirmed to form complexes with Cu(II) and Ag(I), and were applied to prepare CDs using microwave heating method. The as-prepared CDs inherited the specific ion-binding capability from their carbon source and could response to both Cu(II) and Ag(I). The response sensitivity corresponded to the binding energy between the carbon source and metal ions. These experimental results are very important for the further design of CD sensors for a large variety of analytes.

Differentiation and determination of metal ions using fluorescent sensor array based on carbon nanodots

2017 ◽  
Vol 246 ◽  
pp. 680-685 ◽  
Author(s):  
Yapei Wu ◽  
Xue Liu ◽  
Qiuhua Wu ◽  
Jie Yi ◽  
Guolin Zhang
Keyword(s):  
Metal Ions ◽  
Sensor Array ◽  
Fluorescent Sensor ◽  
Carbon Nanodots

Precise determination of the point of sol–gel transition in carbon gel synthesis using a microwave heating method

Carbon ◽  
2010 ◽  
Vol 48 (11) ◽  
pp. 3305-3308 ◽  
Author(s):  
E.J. Juárez-Pérez ◽  
E.G. Calvo ◽  
A. Arenillas ◽  
J.A. Menéndez
Keyword(s):  
Microwave Heating ◽  
Sol Gel ◽  
Precise Determination ◽  
Heating Method ◽  
Carbon Gel ◽  
Sol Gel Transition ◽  
Gel Transition

Comparative study of conventional and microwave heating of polyacrylonitrile-based fibres

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Guozhen Zhao ◽  
Jianhua Liu ◽  
Lei Xu ◽  
Shenghui Guo
Keyword(s):  
Microwave Heating ◽  
Surface Defects ◽  
Energy Dispersive Spectrometer ◽  
Xrd Analysis ◽  
Economic Benefits ◽  
Heating Time ◽  
Oxidation Temperature ◽  
Conventional Heating ◽  
Heating Method ◽  
Molecular Arrangement

Abstract The effects of the conventional heating method and the microwave heating method on polyacrylonitrile-based fibres in the temperature range of 180–280 °C were investigated. Fourier transform infrared spectroscopy, X-ray wide-angle scattering, Raman spectroscopy, energy-dispersive spectrometer, scanning electron microscopy and bulk density were used to characterise the properties of the samples. Results show that the microwave heating method can shorten the pre-oxidation time, reduce pre-oxidation temperature and reduce the number of surface defects. The pre-oxidised fibres obtained by the microwave heating method exhibit not only good crystallite size but also a smooth surface. Atomic morphology and molecular arrangement are orderly inside the fibre. The FT-IR spectrum shows that the oxidation reaction occurs at 220 °C, and the CI value of PAN fibers stabilised by microwave heating is the larger than the fibers stabilised by conventional heating. XRD analysis shows that fibers stabilised by microwave heating have low stack domains. The SEM and Raman spectra indicate that hydrogen peroxide can improve the surface finish of the fibers and reduce defects. Microwave heating can reduce the pre-oxidation temperature by about 20 °C and shorten the heating time. The economic benefits of using this method are significantly improved.

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