Nanowear on Polymer Films of Different Architecture

Berger, Rüdiger; Cheng, Ya‐Jun; Förch, Renate; Gotsmann, Bernd; Gutmann, Jochen S.; Pakuła, Tadeusz; Rietzler, U.; Schärtl, Wolfgang; Schmidt, Manfred; Strack, A.; Windeln, Johannes; Butt, Hans‐Jürgen

doi:10.1021/la0620399

Cited by 55 publications

(58 citation statements)

References 52 publications

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“…Repeated write/erase cycling or simply contact sliding (reading) may eventually rearrange the polymer chains relative to each other even without breaking them, that is, by forming ripple patterns. [23][24][25] As mentioned above, a high degree of crosslinking can resolve this issue. The price to pay for this, however, is a substantially increased T g .…”

Section: Resultsmentioning

confidence: 99%

Designing Polymers to Enable Nanoscale Thermomechanical Data Storage

Gotsmann

Knoll

Pratt

et al. 2010

Adv Funct Materials

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Nanomechanics has been slow in entering nanotechnology because of extreme conditions resulting from scaling. This is an issue in particular for polymers, although widely used in macroscale applications. Highly repetitive nanoscale deformation cycling in combination with excellent shape retention and thermal stability is demonstrated. While generic principles described are pertinent to a range of applications, this demonstration is made on the example of polymer media in high‐density data storage. The information, represented as indents, is written and erased using a heated tip. A high‐performance polymer with a flexible aryletherketone backbone is designed with phenylethynyl crosslink chemistry. After optimization of crosslink density and topology, unprecedented performance is achieved in all relevant metrics. Demonstrations of endurance and retention are performed at 1 Tb in−2 density, showing 108 write cycles using the same tip, 103 erase cycles and 3 × 105 read cycles of the media, and extrapolated to 10 years of retention at 85 °C.

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Section: Resultsmentioning

confidence: 99%

Designing Polymers to Enable Nanoscale Thermomechanical Data Storage

Gotsmann

Knoll

Pratt

et al. 2010

Adv Funct Materials

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“…This is consistent with recent results for more mechanically stable plasma-polymerized coatings under repeated shearing. [30] Moreover, our peel-off test demonstrated that the PP-MAN coatings are extremely stable and cannot be removed with sticky tape. Conventional bimaterial cantilevers are usually based on one-side modification with self-assembled monolayers (SAMs) that facilitate the adsorption of analytes leading to differential surface energy.…”

mentioning

confidence: 84%

“…This could potentially inspire a whole new class of real-time, fast, microscopic chemical sensing arrays of the kind required for environmental monitoring. [30,53] In fact,…”

Section: Adv Mater 2007 19 4248-4255mentioning

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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“…MEMS-based storage devices have two main types of wear: (1) probe wear and (2) medium wear [72,73,74]. Note that MEMS-based storage devices have no rubbing surfaces, so that wear of bearing does not exits, unlike in disk drives.…”

Section: Types and Causes Of Wearmentioning

confidence: 99%

“…Based on the literature [72,73,74] and discussions with physicists, we assume the following in our work:…”

Section: Chapter 5 Wear-leveling Policiesmentioning

confidence: 99%