Electrical properties of polycrystalline GaN films functionalized with cysteine and stabilization of GaN nanoparticles in aqueous media.
GaN was synthesized onto sapphire substrates by chemical vapor deposition, reacting gallium, ammonium chloride and ammonia. The polycrystalline films were immersed in glycine, aspartic acid and cysteine solutions. Cysteine chemisorbed onto GaN films produced detectable changes in conductivity, mobility and Hall coefficient indicating that GaN is capable of detecting and reacting with thiolate groups, which was confirmed by X-ray photoelectron spectroscopy. The Cys-GaN film solution was adjusted to pH 10, upon which the GaN nanoparticles were transferred to the aqueous phase forming a suspension stable for seven days. The alkaline colloid was then further adjusted down to pH 3 retaining stability for three days. The GaN colloid obtained represents a suitable medium to study GaN properties for biological applications.
Departamento de Química, Universidad de Guadalajara, Boulevard Marcelino García Barragán 1421, Guadalajara, Jalisco, Mexico. gregoriocarbajal@yahoo.com.mx
Gregorio Guadalupe Carbajal
GG
Arízaga
Mariana J
MJ
Oviedo
Oscar Edel Contreras
OE
López
D015374:Biosensing Techniques / Q000379:methods; D003545:Cysteine / Q000737:chemistry*; D005708:Gallium / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D053758:Nanoparticles / Q000737:chemistry*; D036103:Nanotechnology / Q000379:methods*; D012996:Solutions / Q000737:chemistry
D012996:Solutions; D005708:Gallium; D003545:Cysteine; C027235:gallium nitrate