Electrical and structural characterisation of mesoporous silica thin films as humidity sensors

Innocenzi, Plinio; Martucci, Alessandro; Guglielmi, Massimo; Bearzotti, Andrea; Traversa, Enrico

doi:10.1016/s0925-4005(01)00590-1

Cited by 76 publications

(47 citation statements)

References 11 publications

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“…According to the IUPAC classification, the inorganic solids that contain pores with diameters in the size range 20-500 Å are considered mesoporous materials. These pores greatly increase the surface area/volume ratio of a material, making them very useful in surface-related applications, such as biosensors [5,6], other sensors [7], electrorheological properties [8], solar cells [9], mimicking photosynthesis [10], catalyst [11], and optical applications [12,13]. A lot of interest has been focused on the study of magnetic properties of Fe-based materials impregnated into the pores of mesoporous materials.…”

Section: Introductionmentioning

confidence: 99%

Preparation, structure, and magnetic properties of mesoporous magnetite hollow spheres

Huang

Tang

2005

Journal of Colloid and Interface Science

120

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Section: Introductionmentioning

confidence: 99%

Preparation, structure, and magnetic properties of mesoporous magnetite hollow spheres

Huang

Tang

2005

Journal of Colloid and Interface Science

120

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“…Although many oxides, including SnO 2 [4], ZrO 2 [5], SiO 2 [6], have been investigated for humidity sensor development, many novel materials and fabrication methods remain to be explored. Further research is requested to optimize the sensor characteristics, e.g.…”

Section: Introductionmentioning

confidence: 99%

Humidity sensors based on ZnO/TiO2 core/shell nanorod arrays with enhanced sensitivity

Zheng

Zhou

et al. 2011

Sensors and Actuators B: Chemical

142

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Highly aligned arrays of ZnO/TiO(2) core/shell nanorods were fabricated on glass substrates by hydrothermal growth of ZnO nanorods cores followed by the deposition of anatase TiO(2) shells in a sol-gel process. The characterization of these composite materials with scanning electron microscopy (SEM), Raman spectroscopy, X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX) and transmission emission microscopy (TEM) points to the formation of crystalline ZnO nanorod cores that are coated with anatase TiO(2) shells. Humidity sensors based on these core/shell nanorod arrays exhibit outstanding sensitivities with capacitances varying from 10(1) to 10(6) pF over a relative humidity (RH) range of 11%-95% at room temperature, which is 1.5 and 3 orders of magnitude higher than that of pristine TiO(2) films and ZnO nanorods, respectively. Complex impedance analysis indicated that the enhanced humidity sensitivity is probably due to the high surface/volume ratio of this core/shell material in combination with the remarkable hydrophilicity of the TiO(2) shell. This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. A c c e p t e d M a n u s c r i p t 2 AbstractHighly aligned arrays of ZnO/TiO 2 core/shell nanorods were fabricated on glass substrates by hydrothermal growth of ZnO nanorods cores followed by the deposition of anatase TiO 2 shells in a sol-gel process. The characterization of these composite materials with scanning electron microscopy (SEM), Raman spectroscopy, X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX) and transmission emission microscopy (TEM) points to the formation of crystalline ZnO nanorod cores that are coated with anatase TiO 2 shells. Humidity sensors based on these core/shell nanorod arrays exhibit outstanding sensitivities with capacitances varying from 10 6 to 10 1 pF over a relative humidity (RH) range of 11% -95% at room temperature, which is 1.5 and 3 orders of magnitude higher than that of pristine TiO 2 films and ZnO nanorods, respectively.Complex impedance analysis indicated that the enhanced humidity sensitivity is probably due to the high surface/volume ratio of this core/shell material in combination with the remarkable hydrophilicity of the TiO 2 shell.

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“…Reaction of these silanol groups with various alkoxysilanes has widely been exploited for preparing functionalized MCM-41 by covalent grafting with various organic moieties [7][8][9]. Functionalized MCM-41 have gained application in the field of electroanalytical chemistry in recent years, such as preconcentration analysis [10,11], electrocatalysis [12,13], bioelectrochemistry [14][15][16], and gas sensors [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Ferricyanide immobilized within organically modified MCM-41; application for electrocatalytic reduction of hydrogen peroxide

Ojani

Raoof

Fathi

2008

J Solid State Electrochem

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Carbon paste electrode modified with aminated Mobil Catalytic Material Number 41 (MCM-41) was prepared and used for immobilization of K 3 [Fe(CN) 6 ] in acidic medium, and then electrochemical behavior of modified electrode containing ferricyanide was studied in detail, including pH-dependence and scan rate effect. Cyclic voltammetry studies showed that the electrode reaction is a surface-controlled process at the scan rate range from 5 to 60 mV s −1 . Also, the electrocatalytic behavior of modified electrode toward the reduction of H 2 O 2 is reported and the effect of pH on catalytic peak current was discussed. According to experimental results, with increasing solution pH, the catalytic effect of this modified electrode is decreased. Catalytic reduction current of H 2 O 2 increases linearly with its concentration. It has been demonstrated that ferricyanide immobilized on the aminated MCM-41 is a stable catalyst for the electrocatalytic reduction of H 2 O 2 .

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Electrical and structural characterisation of mesoporous silica thin films as humidity sensors

Cited by 76 publications

References 11 publications

Preparation, structure, and magnetic properties of mesoporous magnetite hollow spheres

Preparation, structure, and magnetic properties of mesoporous magnetite hollow spheres

Humidity sensors based on ZnO/TiO2 core/shell nanorod arrays with enhanced sensitivity

Ferricyanide immobilized within organically modified MCM-41; application for electrocatalytic reduction of hydrogen peroxide

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