Gold nano dendrite as well as preparation method and application thereof
A gold nano, dendrite technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of small number of hot spots, mismatch of excitation wavelength of LSPR peak, etc., and achieve high repeatability , the effect of high SERS hot spot density and high SERS activity
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Embodiment 1
[0035] The present embodiment provides a method for preparing gold nano-dendrites, and the specific steps are:
[0036] Step 1: ion sputtering a gold nano-film with a thickness of 10 nm on the surface of the conductive substrate; then use a sharp tip to scribe the gold nano-film to form a long and narrow gap;
[0037] Step 2: The conductive substrate obtained in step 1 is placed in the gold electrolyte as the cathode, the rectangular graphite sheet is used as the anode, and water is used as the solvent, containing 1g / L of chloroauric acid, 0.3g / L particle size of The mixed solution of 200nm-5μm ferric oxide powder and 10g / L polyvinylpyrrolidone was used as the gold electrolyte. at 300μA / cm 2 At a constant current density of , gold was electrodeposited on a conductive substrate for 8 h at room temperature;
[0038] Step 3: The conductive substrate obtained in Step 2 is soaked in deionized water and repeatedly washed for several times, and the product is blown dry with an iner...
Embodiment 2
[0042] The present embodiment provides a method for preparing gold nano-dendrites, and the specific steps are:
[0043] Step 1: ion sputtering a gold nano-film with a thickness of 20 nm on the surface of the conductive substrate; then, the gold nano-film is etched by an electron beam etching method to form a long and narrow gap;
[0044] Step 2: The conductive substrate obtained in Step 1 is placed in a gold electrolyte as a cathode, a rectangular graphite sheet is used as an anode, and water is used as a solvent, containing 2g / L of chloroauric acid, 1g / L particle size of 1 -The mixed solution of 3μm ferric oxide powder and 5g / L polyvinylpyrrolidone was used as the gold electrolyte. at 200μA / cm 2 At a constant current density of , gold was electrodeposited on a conductive substrate for 12 h at room temperature;
[0045] Step 3: The conductive substrate obtained in Step 2 is soaked in deionized water and repeatedly washed for several times, and the product is blown dry with a...
Embodiment 3
[0049] The present embodiment provides a method for preparing gold nano-dendrites, and the specific steps are:
[0050] Step 1: ion sputtering a gold nano-film with a thickness of 5 nm on the surface of the conductive substrate; then use a micron-level sharp tip to scribe the gold nano-film to form a long and narrow gap;
[0051] Step 2: The conductive substrate obtained in Step 1 is placed in a gold electrolyte as a cathode, a rectangular graphite sheet is used as an anode, and water is used as a solvent, containing 0.1 g / L chloroauric acid and 0.1 g / L particle size. It is a mixed solution of 0.2-1 μm triiron tetroxide powder and 0.5 g / L polyvinylpyrrolidone as a gold electrolyte. at 100μA / cm 2 At a constant current density of , gold was electrodeposited on a conductive substrate for 16 h at room temperature;
[0052] Step 3: The conductive substrate obtained in Step 2 is soaked in deionized water and repeatedly washed for several times, and the product is blown dry with an...
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Abstract
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