Synthesis Of Carbon And Metal Nanomaterials And Their Analysis Application

Nanomaterials have attracted a great deal of attention because of their unique optical,electrical,magnetic and catalytic properties,and possess the diverse potential applications in food safety,catalysis,nanoelectronics,data storage,environmental protection,biosensors,nanomedicine etc.In this thesis,through effectively designing the multifunctional nanomaterials with excellent electrochemical and optical propties,we carried out a series of research work on sensing applications of these nanomaterials.The main achievements are outlined as following:1 In this work,we have presented a novel strategy to utilize as-synthesized yeast extract-stabilized Cu nanoclusters(Cu NCs)for sensitive and selective detection of S2-.The fluorescence intensity of Cu NCs was enhanced significantly in the presence of both Na2S20g and S2-.By virtue of this specific response,a Cu NC-based fluorescent turn-on sensor was developed,which allows the detection of S2-in the range of 0.02-0.8?M with a detection limit of 10 nM.The enhancing mechanism was also discussed based on fluorescence decay,transmission electron microscopy(TEM)and dynamic light scattering(DLS)studies,indicating that S2-enhanced the Cu NCs emission mainly through sulfide-induced aggregation of Cu NCs.Furthermore,we demonstrated the usability of the present approach for the detection of S2-in water samples,which illustrates its great potential for the environmental monitoring and water quality inspection fields.2 We employed Te nanowire as a sacrificial template to synthesize PdPt BANWs and developed the electrochemical sensor based on PdPt BANWs for sensitive detection of AA.The modified glassy carbon electrode with PdPt BANWs revealed remarkable electrocatalytic activity toward AA.It was found that the PdPt BANWs-based electrochemical sensor was used for detection AA in a linear range of 0.01-0.97 mM with a high sensitivity of 467.9?A mM-1 cm-2 and the detection limit was as low as 0.2?M(S/N=3).In addition,the electrochemical sensor also showed good selectivity,stability and reproducibility,and had been applied to detection of AA in serum samples and commercial vitamin C tablets.3 Low cost?water soluble?environmental-friendly and high fluorescent properties of C-Dots were firstly synthesized by one-step hydrothermal method using yeast extract as carbon source.The C-Dots displayed stable fluorescence intensities under high ionic concentration?extreme pH and long light reaction time,which proves good light stability of the C-Dots.Additionally,the C-Dots were employed for assaying Fe3+.The probe exhibited a wide linear response concentration range(0.3-800?M)to Fe3+ with a detection limit of 0.1?M.The obtained C-Dots have the ability of high sensitivity,high selectivity and good anti-jamming capability to Fe3.