Dissertation > Excellent graduate degree dissertation topics show

The Preparation of Functionaiized Graphene Modified Electrode Sensors and Application in Electroanalytical Chemistry

Author: WangLeTao
Tutor: WangChunMing; ZhangZuo
School: Lanzhou University
Course: Analytical Chemistry
Keywords: Functional ized Graphene Chemical modified electrode Poly(diallyldimethylammonium chloride)(PDDA) AuNPS L-arginine Simultaneousdetermination Catechol Hydroquinone Alkannin Bisphenol A
CLC: O657.1
Type: Master's thesis
Year: 2013
Downloads: 35
Quote: 0
Read: Download Dissertation

Abstract


In this paper, functionalized graphene and its composites were used as modified electrode materials. Then several electrochemical sensors were fabricated based on the modified electrodes for sensitivity determination of real samples. The major contents are described as follows:1. The poly (diallyldimethylammonium chloride)(PDDA) functionalized graphene nanosheets (PDDA-G) were prepared. Simultaneous determination of catechol (CC) and hydroquinone (HQ) were investigated by cyclic voltammetry (CV) and square wave voltammetry (SWV) based on PDDA-G modified glassy carbon electrode (PDDA-G/GCE). The modified electrode showed excellent sensitivity and selectivity towards the two dihydroxybenzene isomers. Under the optimized conditions, the PDDA-G/GCE showed the wide linear range and low detection limits to CC and HQ respectively. The proposed method was applied to simultaneously determine CC and HQ in water samples with satisfactory results.2. Au-PDDA-G nanocomposites were rapidly synthesized via a one-step method, and characterized by X-ray diffraction, transmission electron microscopy, and X-ray photoelectron spectroscopy.An electrochemical sensor based on Au-PDDA-G was fabricated for the sensitive detection of alkannin. The nanocomposite was characterized carefully. Cyclic voltammetry (CV) and differential pulse voltammetry (DPV) were used to investigate the electrochemical behaviors of alkannin on the Au-PDDA-G composite film modified GCE. The linear range of alkannin was from5.0to300nmol/L with a detection limit of1.4nmol/L (S/N=3). Moreover, the sensor could be used for the detection of alkannin in real samples with satisfactory results.3. Arginine (Arg) functionalized graphene (Arg-G) nanocomposite was produced successfully by an environment-friendly method, and the morphology of the nanocomposite was characterized by TEM, Raman spectra etc. Based on Arg-G nanocomposite, a green electrochemical sensor was fabricated for sensitive detection of bisphenol A (BPA). Under the optimized conditions, the oxidation peak current was proportional to BPA concentration in the range between5.0nmol/L and40.0μmol/L with the correlation coefficient of0.9986and the detection limit of1.1nmol/L (S/N=3). The proposed sensor was successfully employed to determine BPA in real plastic products and the recoveries were satisfactory.

Related Dissertations

  1. Fast Determination Method Research of Bisphenol A in Food Packing Material,TS206.4
  2. Synthesis and Performance Study of Bisphenol AP-based Polybenzoxazines,TQ320.1
  3. Study on Synthesis and Physiological Function of N-carbamoyl-glutamate,R914
  4. Curing Mechanism and Properties of Fluorenyl Epoxy Resin,TQ323.5
  5. Cloning and Function Analysis of crp and Tatc Gene from Erwinia Amylovora Strain Ncppb1665,S436.612
  6. Gene Cloning and Expression Analysis of Odorant Receptor and Arginine Kinase Gene from Helicoverpa Assulta (Guenée),S433.4
  7. The Effects of Exposure to Bisphenol-a between Adolescence and Early Adulthood on Behaviors in Mice and Its Molecular Mechanism,R965
  8. Study on Carboxyl Side Groups Containing Poly Aromatic Ether Sulfone Ketone and Modification of Epoxy,O631.3
  9. Application of Temperature-Controlled Ionic Liquid Micro-Extraction in Environmental Analytical Chemistry,X132
  10. A Study of Plasma Levels of ADMA and Its Role in Acute Cerebral Infarction Associated with Type Ii Diabetes,R743.33
  11. Separation of Phenolic Enviromental Endocrine in Wastewater on a PDMS Microchip,X832
  12. Studies on Determination of Terephthalic Acid, Isophthalic Acid and Bisphenol A-Type Contaminants in Foodstuffs,TS207.5
  13. A 1: 2 Case-Control Study on Bisphenol a and Unexplained Recurrent Spontaneous Abortion,R714.21
  14. Studies on the Application of Sequential Injection Technique in the Analysis of Phenolic Organic Pollutants,X830.2
  15. Stability of Polymer Monomer Bpa, 1,4-BD, TPA in Super/sub-critical Water,O631.3
  16. Study on Synthesis of Glycosides Using β-Glucosidase in Non-aqueous Medium,TQ464.3
  17. Preparation of PPV/AuNPs Nanocomposite by Two Different In-situ Methods and Study on Their Fluorescence and Photovoltaic Properties,TB383.1
  18. New Methods for the Degradation of Phenolic Compounds,X703
  19. Screening and Kinetics of High Strength Phenol Degrading Bacterial Strains,X172
  20. Arginine Methylation Modification and Function of p16 Protein,R730.2
  21. Myocardial Protection Effect of L-arginine during Coronary Artery Bypass Graft Surgery,R654.2

CLC: > Mathematical sciences and chemical > Chemistry > Analytical Chemistry > Instrument analysis ( physics and physical chemistry ) > Electrochemical analysis
© 2012 www.DissertationTopic.Net  Mobile