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Studies on carbon-quantum-dot-embedded iron oxide nanoparticles and their electrochemical response

机译：碳 - 量子点嵌入氧化铁纳米粒子及其电化学反应的研究

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A report on the synthesis of carbon-quantum-dot-embedded iron oxide nanoparticles (CQD@Fe(3)O(4)NPs) and their improved electrochemical studies is presented. Fe(3)O(4)NPs and CQD@Fe(3)O(4)NPs were synthesized by the wet-chemical co-precipitation method. X-ray diffraction measurements exhibited pure cubic phase with Fd3m space group in Fe(3)O(4)NPs and CQD@Fe(3)O(4)NPs. Fourier-transform infrared spectroscopy measurements confirmed the functionalization of Fe(3)O(4)NPs with CQDs. Dynamic light scattering measurements revealed a hydrodynamic radius of 520 nm and 319 nm for Fe(3)O(4)NPs and CQD@Fe(3)O(4)NPs, respectively. Moreover, zeta potential measurements showed positively charged Fe(3)O(4)NPs and negatively charged CQD@Fe(3)O(4)NPs. High-resolution transmission electron microscopy measurements showed nearly spherical structure with an average size of around 7 nm for Fe(3)O(4)in both samples, whereas CQDs were nearly 2 nm in size in CQD@Fe(3)O(4)NPs. A biocompatibility study showed that CQD@Fe(3)O(4)NPs were more biocompatible than the bare Fe(3)O(4)NPs. CQD@Fe(3)O(4)NPs were then dispersed in chitosan (CHIT) solution, and drop-casted onto an indium tin oxide (ITO) glass substrate for further study. Atomic force microscopy results showed improved surface roughness of the CQD@Fe3O4-CHIT/ITO electrode, providing a better biosensing platform. The electrochemical response studies of CQD@Fe3O4-CHIT/ITO also showed enhanced electrochemical signal compared to Fe3O4-CHIT/ITO electrodes. Thus, a CQD@Fe3O4-CHIT/ITO electrode was used for the detection of vitamin D-2(10-100 ng ml(-1)) using a differential pulse voltammetry technique. The sensitivity and limit of detection were obtained as 0.069 mu A ng(-1)ml cm(-2)and 2.46 ng ml(-1), respectively.
机译：提出了关于碳 - 量子点嵌入氧化铁纳米粒子（CQD @ Fe（3）O（4）NPS）的合成的报告及其改进的电化学研究。通过湿化学共沉淀法合成Fe（3）O（4）NPS和CQD @ Fe（3）O（4）NPS。 X射线衍射测量表现出纯度立方相，Fe（3）O（4）NPS和CQD @ Fe（3）NPS中的FD3M空间组。傅立叶变换红外光谱测量测量证实了Fe（3）O（4）NPS与CQDS的功能化。动态光散射测量分别显示出520nm和319nm的流体动力半径，Fe（3）o（4）NPS和CQD @ Fe（3）o（4）NPS。此外，Zeta电位测量显示出带正电荷的Fe（3）O（4）NPS和带负电荷的CQD @ Fe（3）O（4）NPS。高分辨率透射电子显微镜测量显示几乎球形结构，平均尺寸为约7nm，用于两种样品中的Fe（3）O（4），而CQD在CQD @ Fe（3）O中尺寸近2nm（4）（4 ）NPS。生物相容性研究表明，CQD @ Fe（3）O（4）NPS比裸FE（3）O（4）NPS更加生物相容性。然后将CQD @ Fe（3）O（4）NPS分散在壳聚糖（Chit）溶液中，并将浇注到氧化铟锡（ITO）玻璃基板上以进行进一步研究。原子力显微镜结果显示CQD @ Fe3O4-Chit / ITO电极的表面粗糙度改善，提供了更好的生物传感平台。与Fe3O4-Chit / ITO电极相比，CQD @ Fe3O4-Chit / ITO的电化学响应还显示出增强的电化学信号。因此，使用差分脉冲伏安法技术使用CQD @ Fe3O4-Chit / ITO电极用于检测维生素D-2（10-100ng（-1））。获得的灵敏度和检测极限分别获得0.069μg（-1）mlcm（-2）和2.46ng ml（-1）。

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