Hybrid Organotin and Tin Oxide-based Thin Films Processed from Alkynylorganotins: Synthesis, Characterization, and Gas Sensing Properties.

Abstract

Hydrolysis-condensation of bis(triprop-1-ynylstannyl)butylene led to nanostructured bridged polystannoxane films yielding tin dioxide thin layers upon UV-treatment or annealing in air. According to Fourier transform infrared (FTIR) spectroscopy, contact angle measurements, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), and scanning electron microscopy (SEM) data, the films were composed of a network of aggregated "pseudo-particles", as calcination at 600 °C is required to form cassiterite nanocrystalline SnO2 particles. In the presence of reductive gases such as H2 and CO, these films gave rise to highly sensitive, reversible, and reproducible responses. The best selectivity toward H2 was reached at 150 °C with the hybrid thin films that do not show any response to CO at 20-200 °C. On the other hand, the SnO2 films prepared at 600 °C are more sensitive to H2 than to CO with best operating temperature in the 300-350 °C range. This organometallic approach provides an entirely new class of gas-sensing materials based on a class II organic-inorganic hybrid layer, along with a new way to include organic functionality in gas sensing metal oxides.

Ultra-thin nanosheets-assembled hollowed-out hierarchical α-Fe2O3 nanorods: Synthesis via an interface reaction route and its superior gas sensing properties

“…As everyone knows, the Fe(OH) 3 is an amorphous state that cannot be detected by XRD or other characterization methods. In order to confirm the generation of amorphous Fe(OH) 3 , the optical images of the precursors in the classical reaction process are given (Fig.…”

“…In order to confirm the generation of amorphous Fe(OH) 3 , the optical images of the precursors in the classical reaction process are given (Fig. 5a).…”

“…Sensing mechanism can be explained by the theory that changes in resistance of semiconductor materials caused by the adsorption of oxygen and reaction with target gas molecules [1,2]. In order to deeply explore the mechanism of oxide semiconductor gas sensors, metal oxide like SnO 2 , ZnO, In 2 O 3, Fe 2 O 3 , NiO, CuO, Co 3 O 4 , and WO 3 have been synthesized and applied to gas sensors [3][4][5][6][7][8][9][10][11][12][13][14][15]. Meanwhile, some reports focused on some new areas such as high-energy facets [16,17], reduction in crystalline size [18], oxide composites [19], core-shell heterostructure nanotubes [20,21], element doping [22] and hierarchical structures [23,24].…”

Synthesis of novel RuO2/NaBi(MoO4)2 nanosheets composite and its gas sensing performances towards ethanol

“…It is well-known that the chemical component and the microstructure play key roles in the gas-sensing characteristics [8,9]. For so far, the gas sensing materials are mostly concentrated on single metal oxide such as ZnO, SnO 2 , TiO 2 , In 2 O 3 , WO 3 , MoO 3 (n-type) [10][11][12][13][14][15] and Co 3 O 4 , NiO (ptype) [16][17][18]. The disadvantage of sensors based on such single metal oxide is the relatively low selectivity to gases which have similar chemical characteristics.…”

Synthesis of polymer/rGO/SnO2 hierarchical structure and its photodegradation of organic pollutants

“…Among the binary metal oxide, tin dioxide (SnO 2 ) is a wellknown large band gap multifunctional material that found widespread applications in the fields of lithium rechargeable batteries [4], gas sensors [5][6][7], and photovoltaic conversion [8][9][10]. Because of the more positive conduction band (CB) edge, SnO 2 is a better electron acceptor than TiO 2 and ZnO [11,12] that makes it a good potential candidate in the field of photocatalysis.…”