Enhanced gas selectivity induced by surface active oxygen in SnO/SnO<sub>2</sub> heterojunction structures at different temperatures

Yin, Guilin; Sun, Jianwu; Zhang, Fang; Yu, Weiwei; Peng, Fang; Sun, Yun; Chen, Xin; Xu, Lei; Lü, Jing; Luo, Chao; Ge, Mingqiao; He, Dannong

doi:10.1039/c8ra09965k

Cited by 10 publications

(3 citation statements)

References 37 publications

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“…Moreover, the combination of n-type SnO 2 and p-type SnO to form heterojunctions has also been gaining increasing attention in recent years, especially in optoelectronics, Li storage [ 18 ], and as chemiresistive sensor with enhanced sensibility for a variety of gases, such as NO 2 [ 19 ], H 2 [ 20 ], acetone [ 21 ], or formaldehyde gas [ 22 ]. In those cases, the variability of SnO geometries and hierarchical structures are fundamental to the optimal performance of the devices, while the achievement of a controlled local oxidation from SnO to SnO 2 can also lead to the fabrication of p-n heterojunctions at the micro- and nanoscale with improved performance.…”

Section: Introductionmentioning

confidence: 99%

In Situ Local Oxidation of SnO Induced by Laser Irradiation: A Stability Study

et al. 2021

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In this work, semiconductor tin oxide (II) (SnO) nanoparticles and plates were synthesized at room conditions via a hydrolysis procedure. X-ray diffraction (XRD) and transmission electron microscopy (TEM) confirmed the high crystallinity of the as-synthesized romarchite SnO nanoparticles with dimensions ranging from 5 to 16 nm. The stability of the initial SnO and the controlled oxidation to SnO2 was studied based on either thermal treatments or controlled laser irradiation using a UV and a red laser in a confocal microscope. Thermal treatments induced the oxidation from SnO to SnO2 without formation of intermediate SnOx, as confirmed by thermodiffraction measurements, while by using UV or red laser irradiation the transition from SnO to SnO2 was controlled, assisted by formation of intermediate Sn3O4, as confirmed by Raman spectroscopy. Photoluminescence and Raman spectroscopy as a function of the laser excitation source, the laser power density, and the irradiation duration were analyzed in order to gain insights in the formation of SnO2 from SnO. Finally, a tailored spatial SnO/SnO2 micropatterning was achieved by controlled laser irradiation with potential applicability in optoelectronics and sensing devices.

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Section: Introductionmentioning

confidence: 99%

In Situ Local Oxidation of SnO Induced by Laser Irradiation: A Stability Study

et al. 2021

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“…Hence, the applicability of SnO is commonly hindered, regardless of its potential interest as a p-type material in optoelectronics and energy-related applications, based on its good electrical conductivity due to native Sn vacancies and its wide bandgap (2.7-3.4 eV). In order to overcome this limitation, in most cases SnO is encapsulated or combined with SnO 2 [5,6] or other materials [7][8][9]. Fabrication of composites formed by SnO and organic materials such as carbonaceous compounds or polymers has also received increasing interest in recent years.…”

Section: Introductionmentioning

confidence: 99%

Synergetic Improvement of Stability and Conductivity of Hybrid Composites formed by PEDOT:PSS and SnO Nanoparticles

et al. 2020

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In this work, layered hybrid composites formed by tin oxide (SnO) nanoparticles synthesized by hydrolysis and poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS) have been analyzed. Prior to the composite study, both SnO and PEDOT:PSS counterparts were characterized by diverse techniques, such as X-ray diffraction (XRD), Raman spectroscopy, transmission electron microscopy (TEM), photoluminescence (PL), atomic force microscopy (AFM), optical absorption and Hall effect measurements. Special attention was given to the study of the stability of the polymer under laser illumination, as well as the analysis of the SnO to SnO2 oxidation assisted by laser irradiation, for which different laser sources and neutral filters were employed. Synergetic effects were observed in the hybrid composite, as the addition of SnO nanoparticles improves the stability and electrical conductivity of the polymer, while the polymeric matrix in which the nanoparticles are embedded hinders formation of SnO2. Finally, the Si passivation behavior of the hybrid composites was studied.

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“…And SnO x composites were used as active oxygen reduction reaction (ORR) catalysts to promote reaction kinetics [5]. And SnO/SnO 2 heterojunctions assembled from ultrathin nanosheets showed improved properties of gas sensors [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

SnO_x@β–SnO heterostructures and their enhanced photocurrent in photoelectrochemical cell

Zheng

Zeng

Xia

et al. 2020

Mater. Res. Express

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To improve the effective separation of the photogenerated electrons and holes, SnO x @β-SnO composites on titanium meshes were prepared by using a standard one-step hydrothermal procedure. As photoanodes in photoelectrochemical cell, the SnO x @β-SnO composites exhibited a photocurrent density of 150 μA cm −2 at 0.0 V versus Ag/AgCl under visible light illumination. The improved photocurrent can be explained as, the Sn 2+ 5s impurity states in SnO 2 have a band gap energy of 2.24 eV, SnO x @β-SnO composites construct a type-II heterojunction. And titanium meshes have a good conductivity, which is beneficial to transferring electron from the conduction band of SnO 2 to external circuit. Furthermore, the SnO x @β-SnO heterostructures have a larger electrochemical specific surface area, and stronger light absorption from 350-800 nm.

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Enhanced gas selectivity induced by surface active oxygen in SnO/SnO₂ heterojunction structures at different temperatures

Abstract: The development of heterojunction structures has been considered as an important step for sensing materials.

Cited by 10 publications

References 37 publications

In Situ Local Oxidation of SnO Induced by Laser Irradiation: A Stability Study

In Situ Local Oxidation of SnO Induced by Laser Irradiation: A Stability Study

Synergetic Improvement of Stability and Conductivity of Hybrid Composites formed by PEDOT:PSS and SnO Nanoparticles

SnO_x@β–SnO heterostructures and their enhanced photocurrent in photoelectrochemical cell

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Enhanced gas selectivity induced by surface active oxygen in SnO/SnO2 heterojunction structures at different temperatures

Abstract: The development of heterojunction structures has been considered as an important step for sensing materials.

Cited by 10 publications

References 37 publications

In Situ Local Oxidation of SnO Induced by Laser Irradiation: A Stability Study

In Situ Local Oxidation of SnO Induced by Laser Irradiation: A Stability Study

Synergetic Improvement of Stability and Conductivity of Hybrid Composites formed by PEDOT:PSS and SnO Nanoparticles

SnO x @β–SnO heterostructures and their enhanced photocurrent in photoelectrochemical cell

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Enhanced gas selectivity induced by surface active oxygen in SnO/SnO₂ heterojunction structures at different temperatures

SnO_x@β–SnO heterostructures and their enhanced photocurrent in photoelectrochemical cell