PHƯƠNG PHÁP SOLGEL TIO2 - CdS

PHƯƠNG PHÁP SOLGEL TiO2-CdS Nguyễn ĐằngTrai I. TẠO SOL TiO 2 /CdS  CdS: II-VI  TiO 2 : 3.21 eV to 3.4 eV  CdS : 2.42 eV  Các hóa chất cần thiết: ◦ Titanium (IV) isopropoxide. ◦ Cadmium acetate hydrate. ◦ Ethanol. ◦ H 2 S. ◦ HCl. Titanium (IV) isopropoxide  Ti[OCH(CH 3 ) 2 ] 4  Colorless liquid  M = 284 g/mol  d = 0.937 g/cm 3  Melting, boiling: 18–20 °C, 232 °C Cadmium acetate hydrate  (CH 3 CO 2 ) 2 Cd . xH 2 O  (CH 3 CO 2 ) 2 Cd . 2H 2 O ◦ White crystals ◦ M = 266.529 g/mol ◦ d = 2.01 g/cm 3 ◦ Melting point: 130°C ◦ Soluble in water, ethanol. Ethanol  C 2 H 5 OH  Colourless liquid  M = 46.07 g/mol  d = 0.789 g/cm 3  Melting, boiling: −114 °C, 78 °C Hydro sulfua  H 2 S (ít tan trong nước)  Colorless gas.  M = 34.082 g/mol  d = 1.363 g/l  Melting, boiling: -82.30 °C, -60.28 °C  Solubility in water: ◦ 0.4 g/100 ml (20 °C) ◦ 0.25 g/100 ml (40 °C)  Điều chế H 2 S: ◦ Không điều chế trong công nghiệp. ◦ HI+SO 2 H 2 O+H 2 S+I 2 ◦ Trong phòng thí nghiệm: FeS + 2HCl  FeCl 2 + H 2 S Titanium (IV) isopropoxide  Ethanol (5ml : 25ml) Ethanol  Cadmium acetate (25ml : 0.5g) one drop of 0.5M HCl SOL TiO2/CdS Stir in an ice bath Mix in ice bath Colorless Transparent saturated H2S water solution Add slowly Until: Yellow white Semi-transparent II.TẠO SOL CdS Colour: yellow to orange d = 4830 kg m -3 1. Cách 1:  Các hóa chất cần thiết: ◦ Polyethylene glycol (PEG) ◦ Cadmium nitrate (cung cấp Cd) ◦ Thiourea (cung cấp S) ◦ Ethanol ◦ Acetic Acid Polyethylene glycol  H(OCH 2 CH 2 ) n OH [...]... Acid (0.5 ml) Continue stir (1-hour) Stir ( 5-6 hours) SOL Stir (1-hour) Add slowly 2 Cách 2:  Các hóa chất cần thiết: ◦ ◦ ◦ ◦ Cadmium acetate dihydrate (CAD) Thiourea (Tu) 1-Thioglycerol (TG) N,N-dimethylformamide (DMF) Cadmium acetate hydrate  (CH3CO2)2Cd 2H2O ◦ White crystals ◦ M = 266.529 g/mol ◦ d = 2.01 g/cm3 ◦ Melting point: 130°C ◦ Soluble in water, ethanol 1-thioglycerol    HSCH2CH(OH)CH2OH... Bp: 149.5 °C, 170 °C  n-Buthanol      C4H10O Colourless liquid M = 74 g/mol d = 0.8098 g/cm3 Mp, Bp: −89.5 °C, 117.7 °C Khối lượng phân tử các chất Cd: 112  S: 32  Ti: 48  O: 16  N: 14  H: 1  C: 12    CdS: 2.42 eV TiO2: 3.21 eV to 3.4 eV Cadmium nitride 0.35 M n-Buthanol 50 ml  cadmium acetate dihydrate (CAD), thiourea (Tu), and 1-thioglycerol (TG) in 20 mL of N,N-dimethylformamide (DMF)/water... solvent   The growth solution for the CdS film was composed by a mixture of cadmium nitride 0.35 M (98 %, Aldrich), ammonium thiocyanate 1.5 M (J.T Baker) in 50 ml of n-buthanol The growth solutions of the composite were prepared by amixture of the solutions used to grow CdS and TiO2, independently The films were deposited on Corning glass using the Sol-Gel (Dip-Coating) method The substrates were immersed... °C Thiourea      SC(NH2)2 White solid M = 76 g/mol d = 1.405 g/ml Mp: 182 °C N,N-dimethylformamide (CH3)2NC(O)H  Clear liquid  M = 73 g/mol  d = 0.944 g/cm3  Mp, Bp: -6 1 °C, 153 °C  CAD 20 mL Tu DMF  Water (3:1 vol) TG CdS sol 3 Cách 3:  Các hóa chất cần thiết: ◦ Cadmium nitride ◦ Ammonium thiocyanate ◦ n-Buthanol Cadmium nitride Cd3N2  Black powder  M = 365 g/mol   3Cd(NH2)2(s) (180°C)... same velocity after 5 min After the deposition, the films were dried at room temperature and were later thermally treated at 300 ± C during 30 min in argon flux and at atmospheric pressure SEM, Micro-Raman, UV-Vis  . PHƯƠNG PHÁP SOLGEL TiO 2- CdS Nguyễn ĐằngTrai I. TẠO SOL TiO 2 /CdS  CdS: II-VI  TiO 2 : 3.21 eV to 3.4 eV  CdS : 2.42 eV  Các hóa chất cần thiết:. 0.5M HCl SOL TiO2/ CdS Stir in an ice bath Mix in ice bath Colorless Transparent saturated H2S water solution Add slowly Until: Yellow white Semi-transparent II.TẠO SOL CdS Colour:. (0.5 ml) Stir Continue stir (1-hour) Cadmium nitrate (0.3 mol/l) Thiourea (0.3, 0.4 , 0.6 mol/l)  Ethanol Stir (1-hour) Add slowly SOL Stir ( 5-6 hours) 2. Cách 2:  Các hóa chất