Method for making a nano-composite gas sensor
There is disclosed a method for making a nano-composite gas sensor. At first, there is provided a substrate. Then, electrodes are provided on the substrate in an array. Finally, a gas-sensing membrane is provided on the electrodes. The gas-sensing membrane includes a nano-conductive film and a peptide film.
1. A method for making a nano-composite gas sensor including the steps of:
providing a substrate;
providing electrodes on the substrate in an array; and
providing a gas-sensing membrane on the electrodes, wherein the gas-sensing membrane includes a nano-conductive film and a peptide film, wherein the peptide film is made of a material selected from the group consisting of Beta-Amyloid (1-40), Human galectin-1 and Human albumin.
2. The method for making a nano-composite gas sensor according to claim 1 , wherein the substrate includes an insulating material coated on a material selected from the group consisting of metal, semiconductor and ceramic materials.
3. The method for making a nano-composite gas sensor according to claim 2 , wherein the semiconductor is provided in the form of a silicon wafer.
4. The method for making a nano-composite gas sensor according to claim 1 , wherein the electrodes are made of a material selected from the group consisting of gold, platinum, silver and aluminum.
5. The method for making a nano-composite gas sensor according to claim 1 , wherein the electrodes are made of a configuration selected from the group consisting of fork-shaped, elongated and helical.
6. The method for making a nano-composite gas sensor according to claim 1 , wherein the peptide film is provided on the nano-conductive film.
7. The method for making a nano-composite gas sensor according to claim 1 , wherein the nano-conductive film is made of a material selected from the group consisting of carbon nanotubes, carbon black, carbon balls and graphene.
8. The method for making a nano-composite gas sensor according to claim 7 , wherein the carbon nanotubes are evenly dispersed in a solvent selected from the group consisting of MEK, IPA, H 2 O and PVA to provide a carbon nanotube-based mixture of 0.1 wt % to 2.0 wt % of carbon nanotubes.
9. The method for making a nano-composite gas sensor according to claim 7 , wherein the carbon nanotubes are evenly dispersed in a solvent selected from the group consisting of MEK, IPA, H 2 O and PVA to provide a carbon nanotube-based mixture that includes 0.5 wt % to 1.0 wt % of carbon nanotubes.
10. The method for making a nano-composite gas sensor according to claim 1 , wherein the peptide film is made by evenly dispersing peptide in a solvent selected from the group consisting of Toluene, THF and H 2 O to provide a peptide-based mixture that includes 5 wt % to 50 wt % of peptide.
11. The method for making a nano-composite gas sensor according to claim 1 , wherein the peptide film is made by evenly dispersing peptide in a solvent selected from the group consisting of Toluene, THF and H 2 O to provide a peptide-based mixture that includes 10 wt % to 45 wt % of peptide.
12. The method for making a nano-composite gas sensor according to claim 1 , wherein the step of providing the gas-sensing membrane includes the steps of:
providing the nano-conductive film by evenly dispersing carbon nanotubes in a solvent to provide a carbon nanotube-based mixture; providing the peptide film by evenly dispersing peptide in the solvent to provide a peptide-based mixture;
evenly providing 1 to 3 μL of the carbon nanotube-based mixture on the electrodes;
drying the carbon nanotube-based mixture in a vacuum oven at 50 to 70 degrees Celsius for 1 to 3 hours to form the nano-conductive film with a resistance of 1 to 10 KΩ;
evenly providing 1 to 3 μl of the peptide-based mixture on the nano-conductive film; and
drying the peptide-based mixture in a vacuum oven at 50 to 60 degrees Celsius for 1 to 4 hours to form the peptide film.
13. The method for making a nano-composite gas sensor according to claim 12 , wherein the solvent is selected from the group consisting of MEK, IPA, H 2 O and PVA.
14. The method for making a nano-composite gas sensor according to claim 1 , wherein the step of providing the gas-sensing membrane includes the steps of:
providing the nano-conductive film by evenly dispersing carbon nanotubes in a solvent to provide a carbon nanotube-based mixture;
providing the peptide film by evenly dispersing peptide in the solvent to provide a peptide-based mixture;
evenly providing 1 to 10 μL of the carbon nanotube-based mixture on the electrodes;
drying the carbon nanotube-based mixture in a vacuum oven at 40 to 80 degrees Celsius for 1 to 5 hours to form the nano-conductive film with a resistance of 1 to 50 KΩ;
evenly providing 1 to 10 μl of the peptide-based mixture on the nano-conductive film; and
drying the peptide-based mixture in a vacuum oven at 40 to 60 degrees Celsius for 1 to 5 hours to form the peptide film.
15. The method for making a nano-composite gas sensor according to claim 14 , wherein the solvent is selected from the group consisting of MEK, IPA, H 2 O and PVA.