Formation enthalpies of Sn clusters: a calorimetric investigation

Bachels, Thomas

doi:10.1016/s0009-2614(98)01376-1

Cited by 24 publications

(16 citation statements)

References 17 publications

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“…However, as the cantilever length increases so does the thermal noise which limits the achievable resolution. However, the best sensitivity of the cantilever heat mode is orders of magnitude higher than that of traditional thermal methods performed on milligram samples, as it only requires nanogram amounts of sample and achieves nanojoules [94] to picojoules [95,96] sensitivity.…”

Section: Heat Sensing Behaviormentioning

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: Heat Sensing Behaviormentioning

confidence: 99%

Bimaterial Microcantilevers as a Hybrid Sensing Platform

et al. 2008

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“…(a) Schematic description of the molecular beam apparatus, which allows the calorimetric investigation of isolated tin clusters from a measurement of the heat released during the cluster deposition process [11]. ( b) Micromechanical calorimeter based on a bimetallic cantilever as a temperature sensor [12]. (c) Thin film calorimeter with a pyroelectric PVDF polymer foil as a temperature sensor [13].…”

Section: Dependence Of Formation Energies Of Tin Nanoclusters On Theimentioning

confidence: 99%

“…1(b)]. This calorimeter has the advantage of a very high heat sensitivity in combination with a very short response time [11,12], but it has the disadvantage that the total cantilever bending is a result of the released heat in combination with the momentum transferred during the cluster deposition. Therefore, the determination of the released heat requires an additional measurement of the transferred momentum.…”

Section: Dependence Of Formation Energies Of Tin Nanoclusters On Theimentioning

confidence: 99%

“…These nanocrystallites are about 100 times larger than the calorimetrically investigated mean cluster sizes. Since the measured released heats per atom q are related to the difference in the internal energy of tin atoms in the isolated clusters and the bulk, the measurement of q allows a determination of the formation energies per atom De f of the isolated tin clusters [12]. However, for this purpose the nonequilibrium situation of the cluster deposition process has to be considered.…”

Section: Dependence Of Formation Energies Of Tin Nanoclusters On Theimentioning

confidence: 99%

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Dependence of Formation Energies of Tin Nanoclusters on their Size and Shape

Bachels

Güntherodt

2000

Phys. Rev. Lett.

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In a novel molecular beam experiment we have calorimetrically investigated the dependence of the formation energies of isolated Sn(N) clusters on their size. The experimentally determined size dependence of the formation energy for Sn(N) clusters consisting of between 95 and 975 atoms can be explained by the existence of two different types of cluster isomers: One class of isomers is characterized by formation energies proportional to N(-1/3), indicating compact spherical-like shapes. The other class has constant formation energies for the investigated size range, which is consistent with quasi-one-dimensional geometries.

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“…Heat changes are either caused by external influences, such as a change in temperature, occur directly on the surface by exothermal, e.g., catalytic, reactions, or are due to material properties of a sample attached to the apex of the cantilever (micromechanical calorimetry). The sensitivity of the cantilever heat mode is orders of magnitude higher than that of traditional calorimetric methods performed on milligram samples, as it only requires nanogram amounts of sample and achieves nanojoules [9] to picojoules [22,23] sensitivity.…”

Section: Heat Modementioning

confidence: 99%

Microcantilever Sensors

Lang¹,

Gerber²

2008

Topics in Current Chemistry

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Microfabricated cantilevers have been used in atomic force microscopy for the topography imagingof non-conductive surfaces for more than 20 years. Cantilever beams without tips have proved theirapplicability in recent years as miniaturized, ultrasensitive, and fast-responding sensors for applicationsin chemistry, physics, biochemistry, and medicine. Microcantilever sensors respond by bending dueto the absorption of molecules. A shift in resonance frequency also occurs. They can be operatedin different environments such as gaseous environment, liquids, or vacuum. In gas, microcantileversensors can be operated as an artificial nose, whereby the bending pattern of a microfabricatedarray of eight polymer-coated silicon cantilevers is characteristic of the different vapors from solvents,flavors, and beverages. When operated in a liquid, microcantilever sensors are able to detectbiochemical reactions. Each cantilever is functionalized with a specific biochemical probe receptor,sensitive for detection of the corresponding target molecule. Applications lie in the fields of label-and amplification-free detection of DNA hybridization, the detection of proteins as well as antigen-antibodyreactions, and the detection of larger entities, such as bacteria and fungi.

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Formation enthalpies of Sn clusters: a calorimetric investigation

Cited by 24 publications

References 17 publications

Bimaterial Microcantilevers as a Hybrid Sensing Platform

Bimaterial Microcantilevers as a Hybrid Sensing Platform

Dependence of Formation Energies of Tin Nanoclusters on their Size and Shape

Microcantilever Sensors

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