Germanium nanotube top raised array modified by silver nano-particles as well as preparation method and application thereof

Abstract

The invention discloses a germanium nanotube top raised array modified by silver nano-particles as well as a preparation method and application thereof. The array is formed by modifying a raised surface of a germanium nanotube in an aluminium oxide template and a template therein with silver nano-particles. The preparation method comprises the following steps: firstly soaking a blind-hole aluminum oxide template in a mixed aqueous solution of nickel nitrate and phosphoric acid, and then soaking and washing the blind-hole aluminum oxide template with a nickel nitrate aqueous solution, thereby obtaining the blind-hole aluminum oxide template with nickel nitrate absorbed on a hole wall; depositing a germanium nanotube in a blind hole by utilizing a chemical vapor deposition method through the blind-hole aluminum oxide template with nickel nitrate absorbed on the hole wall, and soaking the aluminum oxide template in a sodium hydroxide aqueous solution after removing the un-oxidized aluminum on the back surface of the template by utilizing a stannic chloride solution, thereby obtaining the aluminum oxide template with the germanium nanotube with raised and exposed top in the blind hole; sputtering the silver nano-particles onto the aluminum oxide template in a plasma sputtering instrument, thereby obtaining a target product. The germanium nanotube top raised array can be used as an active substrate of SERS (surface enhanced raman scattering) and can be widely used for the rapid detection in the fields of environment, chemistry, biology and the like.

Description

technical field

[0001] The invention relates to a nanotube array and its preparation method and application, in particular to a germanium nanotube top convex array modified by silver nanoparticles and its preparation method and application. Background technique

[0002] Because germanium (Ge) has the characteristics of high carrier mobility, low growth temperature, biocompatibility and stability, it has a wide range of applications in optoelectronics, energy, biology, medicine and other fields. However, most of the recent research based on semiconductor germanium is limited to the preparation of materials and their applications in the fields of optoelectronics and energy, while the research on the surface-enhanced Raman scattering (SERS) effect of Ge is less. At present, the research on the SERS activity of Ge shows that germanium has a better chemical enhancement effect. Therefore, people try to combine it with noble metals with physical enhancement effect to construct a s...

Examples

Embodiment 1

[0037] The concrete steps of preparation are:

[0038] Step 1, first soak the blind-hole alumina template in a mixed aqueous solution of nickel nitrate and phosphoric acid at a temperature of 35°C for 28 minutes; wherein, the weight ratio of nickel nitrate, phosphoric acid and water is 27:12:200. After taking it out, it was soaked and rinsed with a nickel nitrate aqueous solution with a concentration of 0.4 mol / L to obtain a blind hole alumina template with nickel nitrate adsorbed on the hole wall.

[0039] Step 2, after placing the blind hole aluminum oxide template with nickel nitrate adsorbed on the hole wall in the chemical vapor deposition furnace cavity, vacuumize the chemical vapor deposition furnace cavity and gas path in sequence and use argon to clean it. Subsequently, the furnace chamber was placed under an argon atmosphere, and the temperature was raised from room temperature to 280° C. at a rate of 10° C. / min. Then keep the furnace cavity with a deposition atmosp...

Embodiment 2

[0042] The concrete steps of preparation are:

[0043] Step 1, first soak the blind-hole alumina template in a mixed aqueous solution of nickel nitrate and phosphoric acid at a temperature of 38°C for 26 minutes; wherein, the weight ratio of nickel nitrate, phosphoric acid and water is 28:11:200. After taking it out, it is soaked and rinsed with a nickel nitrate aqueous solution with a concentration of 0.45 mol / L to obtain a blind hole alumina template with nickel nitrate adsorbed on the hole wall.

[0044] Step 2, after placing the blind hole aluminum oxide template with nickel nitrate adsorbed on the hole wall in the chemical vapor deposition furnace cavity, vacuumize the chemical vapor deposition furnace cavity and gas path in sequence and use argon to clean it. Subsequently, the furnace chamber was placed under an argon atmosphere, and the temperature was raised from room temperature to 290° C. at a rate of 10° C. / min. Then keep the furnace cavity with a deposition atmosp...

Embodiment 3

[0047] The concrete steps of preparation are:

[0048] Step 1, first soak the blind-hole alumina template in a mixed aqueous solution of nickel nitrate and phosphoric acid at a temperature of 40°C for 24 minutes; wherein, the weight ratio of nickel nitrate, phosphoric acid and water is 29:10:200. After taking it out, soak and rinse it with a nickel nitrate aqueous solution with a concentration of 0.5 mol / L to obtain a blind hole alumina template with nickel nitrate adsorbed on the hole wall.

[0049] Step 2, after placing the blind hole aluminum oxide template with nickel nitrate adsorbed on the hole wall in the chemical vapor deposition furnace cavity, vacuumize the chemical vapor deposition furnace cavity and gas path in sequence and use argon to clean it. Subsequently, the furnace chamber was placed under an argon atmosphere, and the temperature was raised from room temperature to 300° C. at a rate of 10° C. / min. Then keep the furnace cavity with a deposition atmosphere wi...

technical field

[0001] The invention relates to a nanotube array and its preparation method and application, in particular to a germanium nanotube top convex array modified by silver nanoparticles and its preparation method and application. Background technique

[0002] Because germanium (Ge) has the characteristics of high carrier mobility, low growth temperature, biocompatibility and stability, it has a wide range of applications in optoelectronics, energy, biology, medicine and other fields. However, most of the recent research based on semiconductor germanium is limited to the preparation of materials and their applications in the fields of optoelectronics and energy, while the research on the surface-enhanced Raman scattering (SERS) effect of Ge is less. At present, the research on the SERS activity of Ge shows that germanium has a better chemical enhancement effect. Therefore, people try to combine it with noble metals with physical enhancement effect to construct a s...

Examples

Embodiment 1

[0037] The concrete steps of preparation are:

[0038] Step 1, first soak the blind-hole alumina template in a mixed aqueous solution of nickel nitrate and phosphoric acid at a temperature of 35°C for 28 minutes; wherein, the weight ratio of nickel nitrate, phosphoric acid and water is 27:12:200. After taking it out, it was soaked and rinsed with a nickel nitrate aqueous solution with a concentration of 0.4 mol / L to obtain a blind hole alumina template with nickel nitrate adsorbed on the hole wall.

[0039] Step 2, after placing the blind hole aluminum oxide template with nickel nitrate adsorbed on the hole wall in the chemical vapor deposition furnace cavity, vacuumize the chemical vapor deposition furnace cavity and gas path in sequence and use argon to clean it. Subsequently, the furnace chamber was placed under an argon atmosphere, and the temperature was raised from room temperature to 280° C. at a rate of 10° C. / min. Then keep the furnace cavity with a deposition atmosp...

Embodiment 2

[0042] The concrete steps of preparation are:

[0043] Step 1, first soak the blind-hole alumina template in a mixed aqueous solution of nickel nitrate and phosphoric acid at a temperature of 38°C for 26 minutes; wherein, the weight ratio of nickel nitrate, phosphoric acid and water is 28:11:200. After taking it out, it is soaked and rinsed with a nickel nitrate aqueous solution with a concentration of 0.45 mol / L to obtain a blind hole alumina template with nickel nitrate adsorbed on the hole wall.

[0044] Step 2, after placing the blind hole aluminum oxide template with nickel nitrate adsorbed on the hole wall in the chemical vapor deposition furnace cavity, vacuumize the chemical vapor deposition furnace cavity and gas path in sequence and use argon to clean it. Subsequently, the furnace chamber was placed under an argon atmosphere, and the temperature was raised from room temperature to 290° C. at a rate of 10° C. / min. Then keep the furnace cavity with a deposition atmosp...

Embodiment 3

[0047] The concrete steps of preparation are:

[0048] Step 1, first soak the blind-hole alumina template in a mixed aqueous solution of nickel nitrate and phosphoric acid at a temperature of 40°C for 24 minutes; wherein, the weight ratio of nickel nitrate, phosphoric acid and water is 29:10:200. After taking it out, soak and rinse it with a nickel nitrate aqueous solution with a concentration of 0.5 mol / L to obtain a blind hole alumina template with nickel nitrate adsorbed on the hole wall.

[0049] Step 2, after placing the blind hole aluminum oxide template with nickel nitrate adsorbed on the hole wall in the chemical vapor deposition furnace cavity, vacuumize the chemical vapor deposition furnace cavity and gas path in sequence and use argon to clean it. Subsequently, the furnace chamber was placed under an argon atmosphere, and the temperature was raised from room temperature to 300° C. at a rate of 10° C. / min. Then keep the furnace cavity with a deposition atmosphere wi...

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