Surface chemistry of SnO2 nanowires on Ag-catalyst-covered Si substrate studied using XPS and TDS methods

Sitarz, M.; Kwoka, Monika; Comini, Elisabetta; Zappa, Dario; Szuber, J.

doi:10.1186/1556-276x-9-43

Cited by 17 publications

(31 citation statements)

References 26 publications

(27 reference statements)

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“…This conclusion is opposite to our recent experience, as the presence of Ag catalyst was not observed in VPD SnO2 nanowires deposited on Ag-covered Si(100) substrate [9].…”

Section: Resultscontrasting

confidence: 99%

“…Relying on the SEM (Figure 1) as well as XPS results before and after TDS procedure ( Figure 2), it can be concluded that the gold particles can be covered by the carbon and the bonding between them impedes removing C contaminations during the TDS process. This is a limitation that has not been observed in the case of the previously studied Ag -covered Si(100) substrate [9].…”

Section: Resultsmentioning

confidence: 85%

“…The development in the field of SnO2 -based nanowires tends toward intentionally applying not only other metal oxide additives but also noble metal catalysts such as Pd [18][19][20], Pt [20,21], Ag [9,22] and Au [10,11,23] in order to both induce nucleation of the nanowires [9] and achieve improvement in the sensor signal, operating temperature and stability to humidity [6].…”

mentioning

confidence: 99%

“…In our previous work [9] we have investigated the surface chemistry of SnO2 nanowires deposited on Ag -covered Si substrate by Vapor Phase Deposition (VPD) method using the X-ray Photoelectron Spectroscopy (XPS), in combination with Thermal Desorption Spectroscopy (TDS), with the special emphasis on identifying and avoiding carbon contaminations at the surface that are directly related to the aging effects.…”

mentioning

confidence: 99%

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Surface Properties of Tin Dioxide SnO2 Nanowires Deposited on Si Substrate Covered by Au Catalyst Studies by XPS, TDS and SEM

Kwoka¹,

Sypien²,

Kulis³

et al. 2018

Preprint

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Abstract:The surface chemistry and the morphology of SnO2 nanowires, deposited by Vapour Phase Deposition (VPD) method on Au-covered silicon substrate, were studied before and after subsequent air exposure. For this purpose, surface-sensitive methods including X-ray Photoelectron Spectroscopy (XPS), Thermal Desorption Spectroscopy (TDS) and the Scanning Electron Microscopy (SEM) were applied. The studies presented within this paper allowed to determine the surface non-stoichiometry combined with the presence of carbon contaminations, in a good correlation with the surface morphology. The information obtained within this studies are of great importance for the potential application of SnO2 nanowires deposited on Au covered Si substrate in the field of novel chemical nanosensor devices, since the results can provide an interpretation of how aging effects influence gas sensor dynamic characteristics.

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“…This conclusion is opposite to our recent experience, as the presence of Ag catalyst was not observed in VPD SnO2 nanowires deposited on Ag-covered Si(100) substrate [9].…”

Section: Resultscontrasting

confidence: 99%

Section: Resultsmentioning

confidence: 85%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Surface Properties of Tin Dioxide SnO2 Nanowires Deposited on Si Substrate Covered by Au Catalyst Studies by XPS, TDS and SEM

Kwoka¹,

Sypien²,

Kulis³

et al. 2018

Preprint

Self Cite

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“…Quantitative analysis of the surface chemistry of SnO 2 films was based on the area (intensity) of the main core level XPS O1s, Sn3d, and C1s, weighted by the corresponding atomic sensitivity factor (ASF) and showed that SnO 2 is slightly non-stoichiometric with an [O]/[Sn] ratio of 1.7-1.8. This value is typical for nanostructured metal oxides [41], which have oxygen vacancy defects in the surface region of the SnO 2 grains. XPS measurements also revealed that carbon is the main surface contaminant of the SnO 2 grains.…”

Section: Xps Of the Sno 2 :Au Filmsmentioning

confidence: 97%

The influence of gold nanoparticles on the conductivity response of SnO2-based thin film gas sensors

Korotcenkov

Brînzari

Gulina

et al. 2015

Applied Surface Science

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SnO₂‐SiO₂ 1D Core‐Shell Nanowires Heterostructures for Selective Hydrogen Sensing

Raza

Kaur

Comini

et al. 2021

Adv Materials Inter

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wide band gap (3.6 eV at 300 K), low material cost, fast response, and stability. [4] However, gas sensors composed of SnO 2 and related materials are limited by their low selectivity, for example, interference with other reducing gases such as methane, ethanol, and carbon monoxide that prevents accurate hydrogen detection. [5] It has been demonstrated that SnO 2 -based gas sensors show significant enhancement in their gas-sensing characteristics by combining SnO 2 with secondary-materials, for instance by doping, [6] surface modification with noble metals catalysts (Pd, Au, Ag, Pt) [4b,7] and metal oxides (ZnO, In 2 O 3 , NiO). [5,8] Moreover, SMOX loaded with other materials can exhibit improved sensing characteristics due to modified transducer/receptor functions. Finally, nanoscale heterojunctions can further increase the gas-sensing responses due to the Fermi-level effect. [9] One of the efficient methods to enhance selectivity of chemoresistive gas sensors is to use a catalytic membrane on top of the core-materials. [10] For example, it is possible by using platinum, palladium, and nickel membranes to enhance the hydrogen and ethanol selectivity of a sensor in presence of other interfering gases. [11] Additionally, some metal organic frameworks (MOFs) materials such as zeolitic imidazolate frameworks (ZIF-67 and ZIF-8) have been reported to act as molecular sieves to enhance the selectivity of gas-sensors. [12] Especially, high response-signals were recorded for low concentration of H 2 , whereas no significant response toward other interfering gases such as benzene, toluene, acetone, and ethanol were detected. [12a] On the other hand, metal organic frameworks (MOFs) are not stable at the typical operating temperature of SnO 2 -based gas sensors (around 400 °C). Likewise, the use of a SiO 2 amorphous film onto an active substrate (mostly SnO 2 ) has also been reported to improve the selectivity for hydrogen sensing. [10b,13] In these sensors, the amorphous SiO 2 films apparently acts as "molecular-sieves", effectively decreasing the diffusion of some gases having larger molecular sizes than H 2 , leading to an improved selectivity to H 2 . [14] SiO 2 coatings onto the SMOX are typically produced by chemical vapor deposition (CVD) or soft-chemistry approaches such as the sol-gel process using different silanes such as ethoxysilanes, hexamethyldisiloxane (HMDS), triethoxymethylsilane (TEMS), ethoxy-trimethylsilane (ETMS), and dirthoxydimethylsilane (DEMS) by dip-or spin-coating. [10b,14,15] Even though an improvement in the selectivity towards H 2 detection has been reported by using SiO 2 -SnO 2 based materials, most of these reported SnO 2 is one of the most employed n-type semiconducting metal oxide in chemo-resistive gas-sensing although it presents serious limitations due to a low selectivity. Herein, the authors introduce 1D SnO 2 -SiO 2 core-shell nanowires (CSNWs). The amorphous SiO 2 -shell layer with varying thicknesses (1.8-10.5 nm) is grown onto the SnO 2 nanowires (NWs) by atomic layer d...

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Surface chemistry of SnO2 nanowires on Ag-catalyst-covered Si substrate studied using XPS and TDS methods

Cited by 17 publications

References 26 publications

Surface Properties of Tin Dioxide SnO2 Nanowires Deposited on Si Substrate Covered by Au Catalyst Studies by XPS, TDS and SEM

Surface Properties of Tin Dioxide SnO2 Nanowires Deposited on Si Substrate Covered by Au Catalyst Studies by XPS, TDS and SEM

The influence of gold nanoparticles on the conductivity response of SnO2-based thin film gas sensors

SnO₂‐SiO₂ 1D Core‐Shell Nanowires Heterostructures for Selective Hydrogen Sensing

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Surface chemistry of SnO2 nanowires on Ag-catalyst-covered Si substrate studied using XPS and TDS methods

Cited by 17 publications

References 26 publications

Surface Properties of Tin Dioxide SnO2 Nanowires Deposited on Si Substrate Covered by Au Catalyst Studies by XPS, TDS and SEM

Surface Properties of Tin Dioxide SnO2 Nanowires Deposited on Si Substrate Covered by Au Catalyst Studies by XPS, TDS and SEM

The influence of gold nanoparticles on the conductivity response of SnO2-based thin film gas sensors

SnO2‐SiO2 1D Core‐Shell Nanowires Heterostructures for Selective Hydrogen Sensing

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Product

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SnO₂‐SiO₂ 1D Core‐Shell Nanowires Heterostructures for Selective Hydrogen Sensing