排序方式: 共有8条查询结果,搜索用时 234 毫秒
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Mauro Perfetti Francesco Pineider Lorenzo Poggini Edwige Otero Matteo Mannini Lorenzo Sorace Claudio Sangregorio Andrea Cornia Roberta Sessoli 《Small (Weinheim an der Bergstrasse, Germany)》2014,10(2):323-329
The chemical synthesis and characterization of the first hybrid material composed by gold nanoparticles and single molecule magnets (SMMs) are described. Gold nanoparticles are functionalized via ligand exchange using a tetrairon(III) SMM containing two 1,2‐dithiolane end groups. The grafting is evidenced by the shift of the plasmon resonance peak recorded with a UV–vis spectrometer, by the suppression of nuclear magnetic resonance signals, by X‐ray photoemission spectroscopy peaks, and by transmission electron microscopy images. The latter evidence the formation of aggregates of nanoparticles as a consequence of the cross‐linking ability of Fe4 through the two 1,2‐dithiolane rings located on opposite sides of the metal core. The presence of intact Fe4 molecules is directly proven by synchrotron‐based X‐ray absorption spectroscopy and X‐ray magnetic circular dichroism spectroscopy, while a detailed magnetic characterization, obtained using electron paramagnetic resonance and alternating‐current susceptibility, confirms the persistence of SMM behavior in this new hybrid nanostructure. 相似文献
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Cascianelli Silvia Cornia Marcella Baraldi Lorenzo Cucchiara Rita 《International Journal on Document Analysis and Recognition》2022,25(3):207-217
International Journal on Document Analysis and Recognition (IJDAR) - Handwritten Text Recognition (HTR) in free-layout pages is a challenging image understanding task that can provide a relevant... 相似文献
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Ludovica Margheriti Matteo Mannini Lorenzo Sorace Lapo Gorini Dante Gatteschi Andrea Caneschi Daniele Chiappe Riccardo Moroni Francesco Buatier de Mongeot Andrea Cornia Federica M. Piras Agnese Magnani Roberta Sessoli 《Small (Weinheim an der Bergstrasse, Germany)》2009,5(12):1460-1466
A tetrairon(III) single‐molecule magnet is deposited using a thermal evaporation technique in high vacuum. The chemical integrity is demonstrated by time‐of‐flight secondary ion mass spectrometry on a film deposited on Al foil, while superconducting quantum interference device magnetometry and alternating current susceptometry of a film deposited on a kapton substrate show magnetic properties identical to the pristine powder. High‐frequency electron paramagnetic resonance spectra confirm the characteristic behavior for a system with S = 5 and a large Ising‐type magnetic anisotropy. All these results indicate that the molecules are not damaged during the deposition procedure keeping intact the single‐molecule magnet behavior. 相似文献
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Mannini M Bonacchi D Zobbi L Piras FM Speets EA Caneschi A Cornia A Magnani A Ravoo BJ Reinhoudt DN Sessoli R Gatteschi D 《Nano letters》2005,5(7):1435-1438
We present an implementation of strategies to deposit single-molecule magnets (SMMs) using microcontact printing microCP). We describe different approaches of microCP to print stripes of a sulfur-functionalized dodecamanganese (III, IV) cluster on gold surfaces. Comparison by atomic force microscopy profile analysis of the patterned structures confirms the formation of a chemically stable single layer of SMMs. Images based on chemical contrast, obtained by time-of-flight secondary ion mass spectrometry, confirm the patterned structure. 相似文献
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Samuele Cornia Valeria Demontis Valentina Zannier Lucia Sorba Alberto Ghirri Francesco Rossella Marco Affronte 《Advanced functional materials》2023,33(19):2212517
At the cutting-edge of microwave detection technology, novel approaches which exploit the interaction between microwaves and quantum devices are rising. In this study, microwaves are efficiently detected exploiting the unique transport features of InAs/InP nanowire double quantum dot-based devices, suitably configured to allow the precise and calibration-free measurement of the local field. Prototypical nanoscale detectors are operated both at zero and finite source-drain bias, addressing and rationalizing the microwave impact on the charge stability diagram. The detector performance is addressed by measuring its responsivity, quantum efficiency and noise equivalent power that, upon impedance matching optimization, are estimated to reach values up to ≈2000 A W−1, 0.04 and ≈, respectively. The interaction mechanism between the microwave field and the quantum confined energy levels of the double quantum dots is unveiled and it is shown that these semiconductor nanostructures allow the direct assessment of the local intensity of the microwave field without the need for any calibration tool. Thus, the reported nanoscale devices based on III-V nanowire heterostructures represent a novel class of calibration-free and highly sensitive probes of microwave radiation, with nanometer-scale spatial resolution, that may foster the development of novel high-performance microwave circuitries. 相似文献
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