Humidity sensors based on mesoporous silica thin films synthesised by block copolymers

Bearzotti, Andrea; Bertolo, Johnny Mio; Innocenzi, Plinio; Falcaro, Paolo; Traversa, Enrico

doi:10.1016/s0955-2219(03)00521-1

Cited by 83 publications

(52 citation statements)

References 12 publications

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“…Mesoporous silica films have potential applications in many fields including sensing [21], catalysis [22], optics [23] and microfluidics [16]. For additional reading, Brinker [10][11] and Grosso [12] provide in-depth and comprehensive reviews on films synthesised via EISA techniques and their potential applications.…”

Section: Templated Mesoporous Thin Filmsmentioning

confidence: 99%

Self-assembled templates for the generation of arrays of 1-dimensional nanostructures: From molecules to devices

Farrell

Petkov²,

Morris

et al. 2010

Journal of Colloid and Interface Science

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Self-assembled nanoscale porous architectures, such as mesoporous silica films (MPS), block copolymer films (BCP) and porous anodic aluminas (PAAs), are ideal hosts for templating one dimension (1 D) nano-entities for a wide range of electronic, photonic, magnetic and environmental applications. All three templates offer dimensional scalability and tunability over a wide range, with critical pore sizes for each system well below the 20 nm threshold [1][2][3]. Recently, research has progressed towards controlling the pore direction, orientation and long range order of these nanostructures through so called directed self-assembly (DSA). Significantly, the introduction of a wide range of top-down chemically and physically pre-patterning substrates has facilitated the DSA of nanostructures into functional device arrays. The following review begins with an overview of the fundamental aspects of self-assembly and ordering processes during the formation of PAAs, BCPs and MPS films. Special attention is given to the different ways of directing self-assembly, concentrating on properties such as uni-directional alignment, precision placement and registry of the self-assembled structures to hierarchal or top down architectures. Finally, to distinguish this review from other articles we focus on research where nanostructures have been utilised in part to fabricate arrays of functioning devices below the sub 50 nm threshold, by subtractive transfer and additive methods. Where possible, we attempt to compare and contrast the different templating approaches and highlight the strengths and/or limitations that will be important for their potential integration into downstream processes. ACCEPTED MANUSCRIPT 3 SECTION 1.0: SELF ASSEMBLY AND NANO-ARCHITETCURESThe diversity of self-assembled nanostructures and more importantly, their precise orientation within a thin film (fixed to a substrate) ultimately determines their function and overall application. A large population of research reports to date have focused on identifying these orientations and related periodicities, using x-ray and microscopy tools, as well the development of methods for readily manipulating nanostructures, such as pre-patterning of silicon substrates for the alignment of block copolymers (BCPs) [4] and mesoporous thin films (MTFs) [5] and altering the growth direction of porous anodic alumina (PAA) templates [6]. In this section, a brief synopsis of the mechanisms behind the self-assembly/organisation of each system and highlight nanoscale architectures (and orientations), which are important from a device perspective. Templated mesoporous thin filmsOrdered mesoporous powders were first discovered by researchers at the Mobil Petrochemical Corporation in 1992 and shortly after, sol-gel derived mesoporous silica films were fabricated [1,7].The first series of ordered mesoporous films were reported by Yang et al. in 1996 [8], prepared using initial surfactant concentrations above their critical micelle concentration (CMC). However the films prepared fil...

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Section: Templated Mesoporous Thin Filmsmentioning

confidence: 99%

Self-assembled templates for the generation of arrays of 1-dimensional nanostructures: From molecules to devices

Farrell

Petkov²,

Morris

et al. 2010

Journal of Colloid and Interface Science

View full text Add to dashboard Cite

show abstract

“…For example, mesoporous silica films deposited on interdigitated electrodes have been found to exhibit fast resistive-type response to relative humidity changes or alcohol vapors [202, 203, 206 -208, 212]. Their current response due to conductivity changes upon gas adsorption was significantly affected by nature of the surfactant template used for thin film preparation [206,207]. Conductivity changes in pressed pellets of SnO 2 -MCM-41 particles have been also exploited to detect gaseous analytes, such as CO, H 2 , or CH 4 [246].…”

Section: Gas Sensorsmentioning

confidence: 99%

Electroanalytical Applications of Microporous Zeolites and Mesoporous (Organo)Silicas: Recent Trends

Walcarius¹

2008

Electroanalysis

149

101

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Microporous zeolites and ordered mesoporous (organo)silicas have been widely used as electrode modifiers because of their attractive properties (ion exchange and size selectivity of zeolites, well ordered nanoreactors containing a high number of widely accessible active centers in mesoporous (organo)silicas). These properties have been intelligently combined to selected redox processes to improve the response of the resulting modified electrodes or to design novel electrochemical detection schemes. This up-to-date review provides the recent advances made in the electroanalytical applications of zeolite modified electrodes and discusses the interest of ordered mesoporous (organo)silica materials in electroanalysis.

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“…They hold great potential in a wide range of applications such as photovoltaics, [5][6][7] biochemicals, 8 lithium ion batteries, 9,10 solid oxide fuel cells (SOFCs) 11,12 and sensors. [13][14][15][16] In 1995, Antonelli first reported the preparation of mesoporous TiO 2 via a sol-gel method. 17 The mesoporous structure of TiO 2 is of particular interest because the mesoporous channels offer a large surface area, and the pore wall framework is nanocrystalline, in addition, the thermal stability of mesoporous TiO 2 is better than that of traditional TiO 2 nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Effects of templating surfactant concentrations on the mesostructure of ordered mesoporous anatase TiO2 by an evaporation-induced self-assembly method

Hung

Wang

Huang

et al. 2010

Journal of the European Ceramic Society

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Humidity sensors based on mesoporous silica thin films synthesised by block copolymers

Cited by 83 publications

References 12 publications

Self-assembled templates for the generation of arrays of 1-dimensional nanostructures: From molecules to devices

Self-assembled templates for the generation of arrays of 1-dimensional nanostructures: From molecules to devices

Electroanalytical Applications of Microporous Zeolites and Mesoporous (Organo)Silicas: Recent Trends

Effects of templating surfactant concentrations on the mesostructure of ordered mesoporous anatase TiO2 by an evaporation-induced self-assembly method

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