A. A. Zhukova

Effect of oxygen partial pressure on SnO2 whisker growth

Tin dioxide whiskers have been grown from SnO vapor in a tube furnace in a flowing mixture of argon and oxygen at a constant source temperature, and the effect of oxygen concentration in the carrier gas on the morphology, structure, and phase composition of the whiskers has been studied. The whiskers are about 100 μm in length and are well crystallized. Single-phase, single-crystal SnO2 whiskers can only be obtained in a narrow range of oxygen concentrations.

Vapor growth of SnO2 whiskers

Tin dioxide whiskers have been prepared by vapor growth in a tube furnace in flowing argon at a constant evaporation temperature, and the effect of carrier-gas flow rate during growth on their morphology, phase composition, and IR spectrum has been studied. The whiskers are more than 0.5 mm in length and are well crystallized. Reducing the flow rate of the carrier gas during whisker growth makes it possible to reduce the fraction of phases containing tin in lower oxidation states and favors preferential whisker growth along the c axis.

Effect of surface modification with palladium on the CO sensing properties of antimony-doped SnO2 whiskers

Antimony-doped tin dioxide whiskers have been prepared by vapor growth in a tube furnace in a flowing mixture of argon and oxygen at a constant evaporation temperature. The antimony concentration was measured by laser mass spectrometry. Palladium was deposited by laser ablation. The palladium-modified whiskers exhibit a sensing response to CO at the level of its maximum allowable concentration in the workplace.

Determination of antimony and tin in tin dioxide whiskers by inductively coupled plasma mass spectrometry

A procedure for the determination of antimony and tin in tin dioxide whiskers, which were grown from a gas phase by the vapor-liquid-solid mechanism, was developed. The problem was difficult because the single whiskers are irregularly small in size and have a small weight (about 10−5 g). The procedure is based on the decomposition of a solid sample by cementation on zinc followed by the determination of analytes with the use of inductively coupled plasma mass spectrometry. The procedure developed is characterized by the detection limits of antimony of 0.01–0.03 μg/L and an RSD of 10%. An approach was proposed to estimate the antimony content of single whiskers.

Tin Oxide Whiskers: Antimony Effect on Structure, Electrophysical, Optical and Sensor Properties

Tin dioxide whiskers have been grown from SnO vapor in a tube furnace in a flowing mixture of argon and oxygen at a constant source temperature, and the effect of the oxygen concentration in the carrier gas on the morphology, structure, and phase composition of the whiskers was studied. Single-crystal SnO2 whiskers can only be obtained in a narrow range of oxygen concentrations. Tin dioxide whiskers doped with different concentration of antimony (0–0.25 at.%) have been grown from SnO and Sb2O3 mixtures in a tube furnace in a flowing mixture of argon and oxygen at a constant source temperature. The whiskers are about 100 μm in length and well crystallized. They possess a high structural perfection. The influence of Sb on crystal structure, morphology, optical properties of the SnO2 whiskers is discussed. The electrophysical properties and sensitivity of individual whisker towards NO2 and CO have been investigated.

Effect of antimony on the reaction of nanocrystalline SnO2 with oxygen

Nanocrystalline antimony-doped ([Sb]/([Sb] + [Sn]) = 0–2 at %) SnO2 powders have been synthesized by coprecipitation from solution. The composition, crystal structure, and microstructural parameters of the powders, as well as the antimony distribution in them, have been studied by laser mass spectrometry, X-ray diffraction, low-temperature nitrogen adsorption measurements, and IR spectroscopy. The reaction of the synthesized materials with oxygen has been studied in situ by electrical conductance measurements. Oxygen chemisorption on the surface of unmodified SnO2 leads to predominant formation of the molecular species O2(ads)-. Increasing the Sb concentration in the SnO2‹Sb› samples increases the fraction of the monatomic species O2(ads)-, which can be explained in terms of a combination of crystal-chemical and electronic factors.