Monodisperse hollow gold nanosphere and preparation method and application thereof
A technology of monodispersity and nanospheres, which is applied in the analysis of materials, material analysis through optical means, and measurement devices, etc., can solve the problems of limited use of wide excitation bands, low sensitivity, and high cost, and achieve good uniformity and adjustable wide range of effects
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Embodiment 1
[0031] A monodisperse hollow metal nanosphere, the monodisperse hollow metal nanosphere has a monodisperse hollow inner core and a monodisperse metal nano outer layer, the metal nano outer layer is a gold nano layer, and the monodisperse hollow metal nanosphere The core is formed by corroding titanium dioxide nanospheres. The monodisperse hollow cores are 40 nm in diameter. The thickness of the gold nanolayer is 20 nm.
[0032] A preparation method of monodisperse hollow metal nanospheres, comprising the following steps:
[0033] 1) Add 1ml of freshly prepared 1 M sodium hydroxide to 500 ml of water, stir, then add 50 μl tetrakis hydroxymethyl phosphorus chloride, magnetically stir for 2 minutes, then add 5 ml of 1% chloroauric acid into the mixture, magnetically stir 2 nm gold nanoparticles were obtained in 10 minutes, and stored at 4°C in the dark;
[0034] 2) The ethanol suspension of monodisperse titanium dioxide nanospheres was aminated with 100 μl of 3-aminopropyltrie...
Embodiment 2
[0039] A monodisperse hollow metal nanosphere, the monodisperse hollow metal nanosphere has a monodisperse hollow inner core and a monodisperse metal nano outer layer, the metal nano outer layer is a silver nano layer, and the monodisperse The hollow core is formed by etching monodisperse polystyrene nanospheres. The monodisperse hollow cores are 800 nm in diameter. The thickness of the silver nanolayer is 500 nm.
[0040] A preparation method of monodisperse hollow metal nanospheres, comprising the following steps:
[0041] 1) Add 25 ml of freshly prepared 1 M sodium hydroxide to 1000 ml of water, stir, then add 1000 μl tetrakis hydroxymethyl phosphorus chloride, magnetically stir for 20 minutes, then add 100 ml of 1% chloroauric acid into the mixture, magnetically Stir for 50 minutes to obtain 3 nm gold nanoparticles, and store at 4°C in the dark;
[0042] 2) Aminate the ethanol suspension of monodisperse polystyrene nanospheres with 5000 μl of 3-aminopropyltriethoxysilan...
Embodiment 3
[0048] A monodisperse hollow metal nanosphere, the monodisperse hollow metal nanosphere has a monodisperse hollow inner core and a monodisperse metal nano outer layer, the metal nano outer layer is a copper nano layer, and the monodisperse The hollow core is formed by etching monodisperse silica nanospheres. The monodisperse hollow cores are 400 nm in diameter. The thickness of the copper nanolayer is 250 nm.
[0049] A preparation method of monodisperse hollow metal nanospheres, comprising the following steps:
[0050] 1) Add 12 ml of freshly prepared 1 M sodium hydroxide to 720 ml of water, stir, then add 500 μl tetrakis hydroxymethyl phosphorus chloride, magnetically stir for 10 minutes, then add 50 ml of 1% chloroauric acid into the mixture, magnetically Stir for 30 minutes to obtain 2 nm gold nanoparticles, and store at 4°C in the dark;
[0051] 2) Aminate the ethanol suspension of monodisperse silica nanospheres with 2500 μl of 3-aminopropyltriethoxysilane by stirring...
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