Gold nanoparticles (GNPs) thin films, electrochemically deposited from hydrogen tetrachloroaurate... more Gold nanoparticles (GNPs) thin films, electrochemically deposited from hydrogen tetrachloroaurate onto transparent indium tin oxide (ITO) thin film coated glass, have different color prepared by variation of the deposition condition. The color of GNP film can vary from pale red to blue due to different particle size and their interaction. The characteristic of GNPs modified ITO electrodes was studied by UV–vis spectroscopy, scanning electron microscope (SEM) images and cyclic voltammetry. WO3 thin films were fabricated by sol–gel method onto the surface of GNPs modified electrode to form the WO3/GNPs composite films. The electrochromic properties of WO3/GNPs composite modified ITO electrode were investigated by UV–vis spectroscopy and cyclic voltammetry. It was found that the electrochromic performance of WO3/GNPs composite films was improved in comparison with a single component system of WO3.► Gold nanoparticle (GNP) thin films were electrodeposited onto indium tin oxide coated glass. ► The color of GNP film can vary from pale red to blue. ► The WO3/GNPs composite films were fabricated by sol–gel method. ► Their electrochromic performance was improved in comparison with a single component system of WO3.
Large size gold nanoparticles (GNPs) were directly deposited onto the indium tin oxide (ITO) glas... more Large size gold nanoparticles (GNPs) were directly deposited onto the indium tin oxide (ITO) glass surface by cyclic voltammetric method. The GNPs on ITO substrate were characterized by means of scanning electron microscopy (SEM), UV–vis spectroscopy and X-ray diffraction (XRD). The nucleation and growth steps were controllable in the GNPs deposition procedure. The addition of chloride ion in the electrolysis affected the size and density of GNPs on the ITO surface. The response of refractive index for various organic solvents was also investigated. The sensitivity of refractive index increased as GNPs became larger.
The refractive index sensitivity of gold@silver core-shell nanoparticles on indium tin oxide glas... more The refractive index sensitivity of gold@silver core-shell nanoparticles on indium tin oxide glass was investigated. The thin silver shell was electrodeposited on gold surface by controlling the applied potential and electrodeposition cycles. The refractive index sensitivity at gold@silver core-shell nanoparticles with ultrathin silver shell (~ 0.7 nm) to bulk refractive index was enhanced 76% than that of the Au nanoparticles (Au core) deposited on ITO substrate. This core-shell platform was also applied to detection of biomolecular interactions using the streptavidin-biotin assay. The strategy would reduce greatly the substrate effect of plasmonic sensors.► Thin silver shell was electrodeposited on surface of gold nanoparticles. ► This core-shell nanoparticles were supported by substrate as a sensor platform. ► The refractive index sensitivity was enhanced greatly at ultrathin Ag shell platform. ► This platform was also applied to detection of biomolecular interaction.
A simple low-cost electrochemical approach has been used to directly deposit twin-linked gold nan... more A simple low-cost electrochemical approach has been used to directly deposit twin-linked gold nanoparticles (TGNPs) onto transparent indium tin oxide (ITO) coated film glass. The as-prepared TGNPs have a transverse localized surface plasmon resonance (LSPR) band at 540 nm and a longitudinal LSPR band at about 710 nm. The longitudinal LSPR band of TGNPs exhibits higher refractive index sensitivity (245 nm/RIU) than its transverse LSPR band. The resulting “clean” surface of the TGNPs is easy applied to the further modification. The subsequent bioconjugation of TGNP films with goat anti-mouse-immunoglobulin G (anti-m-IgG) is successfully employed for the detection of mouse-immunoglobulin G (m-IgG) in a model based on the specific binding affinity between the antigen and antibody. The spectrophotometric sensor shows concentration-dependent binding for m-IgG. This study reveals a simple and sensitive method to fabricate a label-free optical biosensor based on longitudinal LSPR band of TGNPs on ITO substrate.
Gold nanoparticles (GNPs) thin films, electrochemically deposited from hydrogen tetrachloroaurate... more Gold nanoparticles (GNPs) thin films, electrochemically deposited from hydrogen tetrachloroaurate onto transparent indium tin oxide (ITO) thin film coated glass, have different color prepared by variation of the deposition condition. The color of GNP film can vary from pale red to blue due to different particle size and their interaction. The characteristic of GNPs modified ITO electrodes was studied by UV–vis spectroscopy, scanning electron microscope (SEM) images and cyclic voltammetry. WO3 thin films were fabricated by sol–gel method onto the surface of GNPs modified electrode to form the WO3/GNPs composite films. The electrochromic properties of WO3/GNPs composite modified ITO electrode were investigated by UV–vis spectroscopy and cyclic voltammetry. It was found that the electrochromic performance of WO3/GNPs composite films was improved in comparison with a single component system of WO3.► Gold nanoparticle (GNP) thin films were electrodeposited onto indium tin oxide coated glass. ► The color of GNP film can vary from pale red to blue. ► The WO3/GNPs composite films were fabricated by sol–gel method. ► Their electrochromic performance was improved in comparison with a single component system of WO3.
Large size gold nanoparticles (GNPs) were directly deposited onto the indium tin oxide (ITO) glas... more Large size gold nanoparticles (GNPs) were directly deposited onto the indium tin oxide (ITO) glass surface by cyclic voltammetric method. The GNPs on ITO substrate were characterized by means of scanning electron microscopy (SEM), UV–vis spectroscopy and X-ray diffraction (XRD). The nucleation and growth steps were controllable in the GNPs deposition procedure. The addition of chloride ion in the electrolysis affected the size and density of GNPs on the ITO surface. The response of refractive index for various organic solvents was also investigated. The sensitivity of refractive index increased as GNPs became larger.
The refractive index sensitivity of gold@silver core-shell nanoparticles on indium tin oxide glas... more The refractive index sensitivity of gold@silver core-shell nanoparticles on indium tin oxide glass was investigated. The thin silver shell was electrodeposited on gold surface by controlling the applied potential and electrodeposition cycles. The refractive index sensitivity at gold@silver core-shell nanoparticles with ultrathin silver shell (~ 0.7 nm) to bulk refractive index was enhanced 76% than that of the Au nanoparticles (Au core) deposited on ITO substrate. This core-shell platform was also applied to detection of biomolecular interactions using the streptavidin-biotin assay. The strategy would reduce greatly the substrate effect of plasmonic sensors.► Thin silver shell was electrodeposited on surface of gold nanoparticles. ► This core-shell nanoparticles were supported by substrate as a sensor platform. ► The refractive index sensitivity was enhanced greatly at ultrathin Ag shell platform. ► This platform was also applied to detection of biomolecular interaction.
A simple low-cost electrochemical approach has been used to directly deposit twin-linked gold nan... more A simple low-cost electrochemical approach has been used to directly deposit twin-linked gold nanoparticles (TGNPs) onto transparent indium tin oxide (ITO) coated film glass. The as-prepared TGNPs have a transverse localized surface plasmon resonance (LSPR) band at 540 nm and a longitudinal LSPR band at about 710 nm. The longitudinal LSPR band of TGNPs exhibits higher refractive index sensitivity (245 nm/RIU) than its transverse LSPR band. The resulting “clean” surface of the TGNPs is easy applied to the further modification. The subsequent bioconjugation of TGNP films with goat anti-mouse-immunoglobulin G (anti-m-IgG) is successfully employed for the detection of mouse-immunoglobulin G (m-IgG) in a model based on the specific binding affinity between the antigen and antibody. The spectrophotometric sensor shows concentration-dependent binding for m-IgG. This study reveals a simple and sensitive method to fabricate a label-free optical biosensor based on longitudinal LSPR band of TGNPs on ITO substrate.
Uploads
Papers by Jiajia Deng