Analysis of nanocrystalline coatings of tin oxides on glass by atomic force microscopy

Baranauskas, Vı́tor; Santos, Thebano E. A.; Schreiner, Marcos Antonio; Jingguo, Zhao; Mammana, Alaide Pellegrini; Mammana, Carlos Ignacio Zamitti

doi:10.1016/s0925-4005(02)00058-8

Cited by 14 publications

(6 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As can be observed in Fig. 5 and for the particular case of samples from zone I (where structural features seem quite similar), the resistivity values follow the evolution of grain size, as already observed by other authors [33][34][35].…”

Section: Influence Of Composition On Electrical Behavioursupporting

confidence: 86%

Property change in multifunctional TiCxOy thin films: Effect of the O/Ti ratio

et al. 2006

View full text Add to dashboard Cite

TiC x O y films with various O/Ti ratios have been deposited by DC magnetron sputtering, using C pieces incrusted in a Ti target erosion area. Composition analysis revealed the existence of three different growth regimes: (i) zone I, corresponding to films with metallic-like appearance, and atomic ratios O/Ti below one; (ii) zone II, with films revealing interference-like colours, and atomic ratios O/Ti higher than 2. Between these two regions, there was a transition zone T, where the atomic ratio O/Ti is between one and two. The films within this zone revealed a brown colour. X-ray diffraction (XRD) structural characterization results showed an evolution from a mixed Ti(C,O) phase at lower O/Ti ratio, to a quasi-amorphous structure within zone T, and poorly crystallized rutile and anatase TiO 2 at the highest O/Ti ratios (zone II). These different structural arrangements resulting from different film's compositions had clear effects on electrical resistivity, whose values increased from about 7 × 10 2 to 2 × 10 11 μΩ cm with increase of the O/Ti ratio. Fourier-transform infrared spectroscopy (FTIR) was used to further confirm the different nature of films structure and, thus, to better understand their properties variation. The observed behaviour was found to be in straight correlation with those of XRD.

show abstract

Section: Influence Of Composition On Electrical Behavioursupporting

confidence: 86%

Property change in multifunctional TiCxOy thin films: Effect of the O/Ti ratio

et al. 2006

View full text Add to dashboard Cite

show abstract

“…These include spray pyrolysis (Paraguay et al 1999), ultrasonic spray pyrolysis (Blandenet et al 1981), chemical vapour deposition (Baranauskas et al 2002), activated reactive evaporation (Randhawa et al 1981), ion-beam assisted deposition, sputtering (Vossen and Poliniak 1972), * Author for correspondence (gotanjain@rediffmail.com) and sol-gel (Chatelon et al 1994;Oreal et al 1994) methods. Among these techniques, spray pyrolysis has proved to be simple, reproducible and inexpensive, as well as suitable for large area applications.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization and gas sensing performance of SnO2 thin films prepared by spray pyrolysis

et al. 2011

View full text Add to dashboard Cite

Nanocrystalline SnO 2 thin films were successfully prepared using sol-gel dip coating technique. The starting precursor was used as tin chloride dihydrate (SnCl 2 .2H 2 O), ethanol and glycerin. As the prepared films were fired at 500 o C. These films were characterized using XRD, FE-SEM and TEM to known crystal structure, surface morphology and microstructure property. Elemental composition was studied using energy dispersive spectrophotometer (EDAX). The H 2 gas sensing performance of nanocrystalline SnO 2 thin films were investigated and presented. It was found that the nanocrystalline SnO 2 thin films gives maximum gas response (S= 360) at 75 o C. The sensor shows fast speed of response (T Response = 2 s) and quick recover (T recover = 8 s).

show abstract

“…Their production was similar to that of liquid crystal displays made on the CenPRA preindustrial assembly line [14]. Atomic force microscopy (AFM) showed that both glass and SnO 2 were quite flat, with roughness below 10 nm.…”

Section: Methodsmentioning

confidence: 62%

Detection of chemical alterations at internal walls of microchannel flow cells by nondestructive fluorescence depolarization

Quintella¹,

Lima²,

Mammana³

et al. 2004

Journal of Colloid and Interface Science

View full text Add to dashboard Cite

A recent trend is the production of workable microchannel flow cells (MF cells). The nondestructive methods used to assess their reliability are based mainly on output monitoring and do not evaluate internal chemical interactions. We investigate a nondestructive method for evaluating changes in the chemical composition of the inner walls based on evaluation of the extent of alignment of a fluorescent probe in a liquid flowing within MF cells. Two MF cells were built with a 10-microm inner spacing. Their inner walls had four parallel SnO(2) strips, 2.00 mm wide, separated by 0.50-mm-wide glass strips. One cell had strips parallel to the flow and the other perpendicular. Flow-induced intermolecular alignment of rhodamine B in monoethylene glycol was scanned with 28-microm precision by fluorescence depolarization, using polarized-laser-induced fluorescence within induced flows (PLF-FI). No changes of polarization were seen when the flow was stopped. Under flowing conditions, polarization was always 4% lower in the glass region as compared to SnO(2). Glass had a higher solid-liquid interfacial tension (determined by contact angle measurements), thus being more wettable and increasing the drag, which propagates into the liquid flow, decreasing polarization. PLF-FI can thus identify regions with different chemical constitutions.

show abstract

Analysis of nanocrystalline coatings of tin oxides on glass by atomic force microscopy

Cited by 14 publications

References 15 publications

Property change in multifunctional TiCxOy thin films: Effect of the O/Ti ratio

Property change in multifunctional TiCxOy thin films: Effect of the O/Ti ratio

Synthesis, characterization and gas sensing performance of SnO2 thin films prepared by spray pyrolysis

Detection of chemical alterations at internal walls of microchannel flow cells by nondestructive fluorescence depolarization

Contact Info

Product

Resources

About