Influence of the supporting salt concentration on the electrodeposition of ZnO/eosin Y hybrid films

Boeckler, Cathrin; Oekermann, Torsten; Saruban, M.; Ichinose, Keigo; Yoshida, Tsukasa

doi:10.1002/pssa.200779423

Cited by 6 publications

(6 citation statements)

References 11 publications

(9 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The intensity of (0 0 2) peak increases with the rise of deposition temperature and it maximizes at 60°C and 70°C. This has been reported before for electrodeposited ZnO films [33,34]. The same orientation is still seen for the hybrid films deposited with 10 lM-60 lM concentration of dye in the electro-deposition bath.…”

Section: Crystallinitysupporting

confidence: 79%

Characterization of electrodeposited zinc oxide/tetrasulphonatedcopper phthalocyanines (ZnO/Ts-CuPc) hybrid films and their photoelectrochemical properties

Marı́

Moya

Singh

et al. 2011

Journal of Electroanalytical Chemistry

View full text Add to dashboard Cite

a b s t r a c tHybrid films of zinc oxide (ZnO) and tetrasulphonatedcopper phthalocyanine (Ts-CuPc) have been prepared by cathodic electro-deposition from aqueous O 2 -saturated solutions of ZnCl 2 and Ts-CuPc. The Ts-CuPc content of the films can be varied in a wide range by variation of dye concentration in the electro-deposition bath -from single Ts-CuPc molecules embedded in compact crystalline ZnO to films based on an amorphous Ts-CuPc framework. With increasing dye content the colour of the films changes from light blue to deep blue. All films were characterized by XRD, SEM and AFM. Photoelectro-chemical characteristics of the electrodes were studied by photocurrent spectra and by time-resolved photocurrent measurements in 0.1 M KCl electrolyte. At the same time, changes in the electrical and photoelectrical properties of the films are observed, enabling the tuning of these properties in view of optoelectronic applications. Theoretical calculations based on density functional theory (DFT) models were made to understand the optoelectronic properties of the hybrid films. Different parallel and perpendicular orientations were tested. For the most stable hybrid structure, total and projected densities of states of the system were obtained and the alignment of the levels observed.

show abstract

Section: Crystallinitysupporting

confidence: 79%

Characterization of electrodeposited zinc oxide/tetrasulphonatedcopper phthalocyanines (ZnO/Ts-CuPc) hybrid films and their photoelectrochemical properties

Marı́

Moya

Singh

et al. 2011

Journal of Electroanalytical Chemistry

View full text Add to dashboard Cite

show abstract

“…2.1 Preparation of ZnO, TiO 2 and ZrO 2 thin films Details of the preparation procedure for the ZnO films can be found in previous publications. 9,31,32 Briefly, glass substrates coated with fluorine-doped tin oxide (FTO, 10 O square À1 , Asahi Glass) were first cleaned with acetone, ethanol and distilled water and then etched in 2 M nitric acid for 2 min. ZnO/eosin Y (= EY) hybrid films were then electrodeposited from an oxygen-saturated aqueous solution (T = 70 1C), which contained 0.1 M KCl, 5 mM ZnCl 2 and 80 mM eosin Y, onto the FTO substrate employing a rotating disk setup (300 rpm) featuring an active area of ca.…”

Section: Methodsmentioning

confidence: 99%

Ultrafast dynamics of the indoline dye D149 on electrodeposited ZnO and sintered ZrO2 and TiO2 thin films

Oum

Lohse

Flender

et al. 2012

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

The ultrafast photoinjection and subsequent relaxation steps of the indoline dye D149 were investigated in detail for a mesoporous electrodeposited ZnO thin film and compared with experiments on sintered TiO 2 and ZrO 2 thin films, all in contact with air, using pump-supercontinuum probe (PSCP) transient absorption spectroscopy in the range 370-770 nm. D149 efficiently injects electrons into the ZnO surface with time constants from r70 fs (time-resolution-limited) up to 250 fs, without the presence of slower components. Subsequent spectral dynamics with a time constant of 20 ps and no accompanying change in the oscillator strength are assigned to a transient Stark shift of the electronic absorption spectrum of D149 molecules in the electronic ground state due to the local electric field exerted by the D149 + radical cations and conduction band electrons in ZnO. This interpretation is consistent with the shape of the relaxed PSCP spectrum at long times, which resembles the first derivative of the inverted steady-state absorption spectrum of D149. In addition, steady-state difference absorption spectra of D149 + in solution from spectroelectrochemistry display a bleach band with distinctly different position, because no first-order Stark effect is present in that case. Interference features in the PSCP spectra probably arise from a change of the refractive index of ZnO caused by the injected electrons. The 20 ps component in the PSCP spectra is likely a manifestation of the transition from an initially formed bound D149 + -electron complex to isolated D149 + and mobile electrons in the ZnO conduction band (which changes the external electric field experienced by D149) and possibly also reorientational motion of D149 molecules in response to the electric field. We identify additional spectral dynamics on a similar timescale, arising from vibrational relaxation of D149 + by interactions with ZnO. TiO 2 exhibits similar dynamics to ZnO. In the case of ZrO 2 , electron injection accesses trap states, which exhibit a substantial probability for charge recombination. No Stark shift is observed in this case. In addition, the spectroelectrochemical experiments for D149 + in dichloromethane and acetonitrile, which cover the spectral range up to 2000 nm, provide for the first time access to its complete D 0 -D 1 absorption band, with the peak located at 1250 and 1055 nm, respectively. Good agreement is obtained with results from DFT/TDDFT calculations of the D149 + spectrum employing the MPW1K functional.

show abstract

“…A few researchers 27,28 observed the small growth of film in the presence of dye along the (100) and (101) faces, however, they performed the experiments at room temperature with different ionic strength of the electrolytic bath from that of ours. Almost identical XRD patterns as shown in Fig.…”

Section: Resultsmentioning

confidence: 86%

“…This has been reported before for electrodeposited ZnO films. 27,28 This means that the ZnO crystals grow preferentially with their c-axes perpendicular to the substrate. The reason is an intrinsic anisotropy in the growth rate of ZnO crystals due to differences in the dissolution rates of different ZnO surfaces.…”

Section: Resultsmentioning

confidence: 99%

Growth Mechanism and Morphology of ZnO/eosin-Y Hybrid Thin Films

Mar¹,

Bernabé²,

Krishan-Chander³

et al. 2012

Acta Physico-Chimica Sinica

View full text Add to dashboard Cite

Thin hybrid films of ZnO/eosin-Y were prepared by electrodeposition at -0.8 and -0.9 V in aqueous and non-aqueous baths at temperatures ranging from 40 to 90°C with dye concentrations of 100 and 400 µmol •L -1 . The films were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray analysis (EDX), and absorption spectroscopy. The films prepared in a non-aqueous bath were non-porous and did not adsorb dye molecules on their surface. However, the films grown in aqueous media were porous in nature and adsorbed dye during the deposition of ZnO. Preferential growth of the film along the (002) face was observed, and the highest crystallinity was achieved when the film was deposited at 60°C. The maximum absorption was achieved for the films grown at 60 to 70°C, a deposition potential of -0.9 V, and a dye concentration of 100 µmol •L -1 .

show abstract

Influence of the supporting salt concentration on the electrodeposition of ZnO/eosin Y hybrid films

Cited by 6 publications

References 11 publications

Characterization of electrodeposited zinc oxide/tetrasulphonatedcopper phthalocyanines (ZnO/Ts-CuPc) hybrid films and their photoelectrochemical properties

Characterization of electrodeposited zinc oxide/tetrasulphonatedcopper phthalocyanines (ZnO/Ts-CuPc) hybrid films and their photoelectrochemical properties

Ultrafast dynamics of the indoline dye D149 on electrodeposited ZnO and sintered ZrO2 and TiO2 thin films

Growth Mechanism and Morphology of ZnO/eosin-Y Hybrid Thin Films

Contact Info

Product

Resources

About