Micromechanical Cantilever Technique: A Tool for Investigating the Swelling of Polymer Brushes

Bumbu, Gina-Gabriela; Wolkenhauer, Markus; Kircher, Gunnar; Gutmann, Jochen S.; Berger, Rüdiger

doi:10.1021/la062137u

Cited by 64 publications

(62 citation statements)

References 36 publications

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“…It is important to note that the deflection of MCs during the assembly process was dominated by the differential surface stress while the thermal and gravimetric effects were negligible. [195] MC-based sensing has also been employed to probe swelling of polymer layers [197][198][199] , self assembly of polyelectrolyte monolayers, [194] formation of lipid layers, [200] and conformational changes of proteins. [201,202] It is worth noting that since…”

Section: Probing Kinetics Of Dynamic Systemsmentioning

confidence: 99%

Bimaterial Microcantilevers as a Hybrid Sensing Platform

et al. 2008

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Microcantilevers, one of the most common MEMS structures, have been introduced as a novel sensing paradigm nearly a decade ago. Ever since, the technology has emerged to find important applications in chemical, biological and physical sensing areas. Today the technology stands at the verge of providing the next generation of sophisticated sensors (such as artificial nose, artificial tongue) with extremely high sensitivity and miniature size. The article provides an overview of the modes of detection, theory behind the transduction mechanisms, materials employed as active layers, and some of the important applications. Emphasizing the material design aspects, the review underscores the most important findings, current trends, key challenges and future directions of the microcantilever based sensor technology.

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Section: Probing Kinetics Of Dynamic Systemsmentioning

confidence: 99%

Bimaterial Microcantilevers as a Hybrid Sensing Platform

et al. 2008

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“…It is noteworthy that swelling of coatings has been employed previously as the mechanism to induce differential stress in a bimaterial cantilever for vapor sensing. [40] However, these coatings, amongst others (such as spin-coating, and inkjet printing), resulted in relatively modest deflections, typically of the order of several tens to a hundred nanometers. [41,42] The reported sensitivity of 10 nm/1 % RH for plasma-polymercoated cantilevers is more than two orders of magnitude lower than that measured here, indicating an insufficient transfer of swelling-induced stress to the polymer/inorganic interface.…”

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confidence: 99%

Polymer–Silicon Flexible Structures for Fast Chemical Vapor Detection

et al. 2007

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Although there are several aspects that contribute to an efficient chemical sensor system, the choice of responsive materials can help to optimize several key attributes critical for their ultimate performance, specifically high sensitivity, selectivity, fast response time, and wide dynamic range. Some common issues reported to date for sensors are limited detection range, slow response time, long recovery period, and fast saturation (limited dynamic range).[1] Most of these issues are directly related to the large volume of bulk porous material that is needed for measurable signal output, which leads to inherently slow sorption, diffusion, and desorption processes. One type of gas sensor that receives only limited attention despite being among the most frequently used sensors for measuring important environmental quantities is the humidity sensor.[2]Important applications of this type of sensor include for respiratory equipment, incubators, chemical gas purification, and surgical operations. The main requirements for humidity sensors are good sensitivity over a wide humidity range, low hysteresis, good reproducibility, and longevity. [2,3] Often sensors are required to be very small and suitable for integration into arrayed systems, such as odor-sensing arrays. Humidity sensors currently tend to exploit the characteristics of bulk materials with the required resistive and capacitive response properties. This type of sensor comprises a moisture sensitive ceramic, metal, or polymer material that undergoes changes in resistance or capacitance with variations in ambient humidity. [3,4] Water vapor sensors that use polymeric materials commonly incorporate polyimides, polycarbonates, cellulose acetates, or conductive polymers. [5,6] The typical vapor sensitivity of such sensors is of the order of tens of parts per million (or ±0.05 % relative humidity, RH), which is sufficient for most routine measurements. However, this is not acceptable if a fast, real-time monitoring of vapor content variation is required. Increased sensitivity, to a low ppm level, can be achieved using a porous material to maximize the specific surface area available for water vapor adsorption. [7][8][9] For example, 0.4 ppm v (parts per million by volume) water vapor detection was demonstrated by Salonen et al. using carbonized porous silicon.[9] Bruno et al. used a polymer-coated resonant device to obtain a sensitivity of 7 ppm v .[10] In these cases, although the sensors reported showed good sensitivity they suffered sluggish response times, often requiring a few minutes to completely recover. Currently, modest sensitivity and slow response are the main obstacles to the design and development of microcantilever-based sensor technology. [11,12] In this Communication, we present a bimaterial design for humidity sensing with a vapor-sensitive plasma-polymerized nanolayer coating on a silicon microcantilever with a low flexural rigidity (Fig. 1a,d). The coating acts as a sensitive mechanical actuator, which mediates high internal stresses, enabling...

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“…Кантилеверные сен соры, работающие в статическом режиме, имеют высокую степень защиты от неспецифического свя зывания, так как энергия неспецифического взаи мкм µm Рис. 4 [33] #5 / 67 / 2016 reliability of the hybridization was confirmed by fluorescence measure ments and by secondary hybridiza tion of DNA probes with attached gold nanoparticle.…”

Section: преимущества и недостатки биосенсоров на основе микрокантилеunclassified