Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 4, Issue 3, Pages 1666-1674Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am201811x
Keywords
hydrophobic surface; hydrophilic surface; tin oxide; nanosheet; molecular sensor; cancer sensor
Funding
- METI, Japan, R&D for High Sensitivity Environment Sensor Components
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Tin oxide nanosheets were crystallized on transparent conductive oxide substrates of fluorine-doped tin oxide in aqueous solutions. The nanosheets had chemical ratio of Sn:O:F = 1:1.85:0.076, suggesting fluorine doping into SnO2. They were hydrophobic surfaces with contact angle of 140 degrees. They were converted to hydrophilic surfaces with contact angle of below 1 degrees by light irradiation. The simple water process will be. applied to surface coating of polymers, metals, biomaterials, papers, etc. Furthermore, the tin oxide nanosheets were modified with dye-labeled monoclonal antibody. Monoclonal antibody reacts with human alpha-fetoprotein in blood serum of hepatocellular cancer patient. Photoluminescence and photocurrent were obtained from the nanosheets under excitation light. Photoelectric conversion was an essence in the sensing system. The tin oxide nanosheets with dye-labeled prostate specific antigen will be used for electrodes of prostate cancer sensors.
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