Selective Functionalization of Two-Component Magnetic Nanowires

Bauer, Laura Ann; Reich, Daniel H.; Meyer, Gerald J.

doi:10.1021/la034613b

Cited by 76 publications

(66 citation statements)

References 29 publications

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“…[7,8] One of the important classes of building-block structures is magnetic nanowires. [9,10] If magnetic nanocrystals can be made in the desired size, shape, and morphology to assemble nanowires, one may be able to tune the magnetic properties of the resulting nanowires. Herein we report a novel bionanotechnological method for fabricating magnetic nanotubes with the aid of magnetic bacteria.…”

mentioning

confidence: 99%

Magnetic Nanotube Fabrication by Using Bacterial Magnetic Nanocrystals

Banerjee

Shima

et al. 2005

Advanced Materials

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confidence: 99%

Magnetic Nanotube Fabrication by Using Bacterial Magnetic Nanocrystals

Banerjee

Shima

et al. 2005

Advanced Materials

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“…Pt-Segmente eines elektrochemisch synthetisierten Nanostabs. In ähnli-chen Studien funktionalisierten Meyers et al [102] die Au-und Ni-Komponenten eines Nanostabs selektiv mit Nonylmercaptan bzw. Häm-IX-Porphyrin.…”

Section: Oberflächenmodifizierungunclassified

“…Im Anschluss an eine derartige Funktionalisierung von Mehrkomponenten-Nanostäben konnten weitere selektive Umwandlungen auf den Monoschichten vorgenommen werden (Amid-, Thioharnstoff-und Thioetherkupplungen). [102] Einige Beispiele für die Selbstorganisation vielsegmentiger Nanostäbe profitieren von dieser Affinitätsbindung. So beschrieben Searson und Mitarbeiter [104] die gezielte Verknüpfung der Enden von Au-Pt-Au-und Au-Ni-Au-Nanostäben mithilfe von Biotin-Avidin-Erkennung (Abbildung 5).…”

Section: Oberflächenmodifizierungunclassified

Vielsegmentige Nanostäbe: Templatsynthese und Eigenschaften

et al. 2006

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Nanomaterialien gewinnen in den Natur‐ und Ingenieurwissenschaften rasant an Stellenwert. Für viele derartige Materialien sind inzwischen zuverlässige Synthesen verfügbar, die vielfältige Anwendungen in allen Bereichen von Nanowissenschaften und Nanotechnologie ermöglicht haben. Bisweilen ist es erwünscht, dass ein einziges Nanomaterial mehrere Funktionen zugleich ausübt, sodass sich die Forschung zu Mehrkomponenten‐Nanomaterialien wie Kern‐Schale‐ oder Legierungsnanopartikeln sowie gestreiften Nanodrähten intensiviert. Solche multifunktionalen Strukturen bieten vielversprechende Perspektiven für die Entwicklung von neuartigen Anwendungen. Dieser Aufsatz präsentiert aktuelle Fortschritte bei der Synthese vielsegmentiger eindimensionaler Nanostäbe und ‐drähte mit Metallen, Halbleitern, Polymeren, Molekülen und sogar Lücken als Komponenten. Zudem werden Anwendungen dieser Mehrkomponenten‐Nanomaterialien in den Bereichen Magnetismus, Selbstorganisation, Elektronik, Biologie, Katalyse und Optik vorgestellt. Ein besonderer Schwerpunkt liegt auf neuen Materialien und Anwendungen, bei denen die Vorteile von Mehrkomponenten‐Nanodrähten gegenüber Einkomponentenstrukturen zutage treten.

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“…The carboxylic acid moiety has a strong affinity for nickel but relatively little affinity for gold. [28][29][30] Indeed, confocal Raman imaging of the nanostructures shows a response only from the nickel end adjacent to the gold disk pair (point B, Figure S2). This observation is consistent with the conclusion that the phthalic acid molecules adsorb on the nickel but not on the gold portions of the nanostructure.…”

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Surprisingly Long‐Range Surface‐Enhanced Raman Scattering (SERS) on Au–Ni Multisegmented Nanowires

Wei

Millstone

et al. 2009

Angewandte Chemie

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An appropriate wavelength of light impinging on a noble metal nanostructure can cause the conduction-band electrons to oscillate collectively, resulting in localized surface plasmon resonance (LSPR) excitation. [1,2] This process generates enhanced electromagnetic (EM) fields at the surface of the nanostructure that can be several orders of magnitude larger than the incident optical excitation fields, [2][3][4][5][6] leading to many types of surface-enhanced phenomena, [3,5,[7][8][9][10][11][12][13][14] including surface-enhanced Raman scattering (SERS). SERS has been extensively studied for several decades, [5,15] and it is often described as a near-field phenomenon that occurs when the Raman-active molecules are in proximity to the surface of the nanostructure, as the enhanced EM fields decay rapidly with distance from its surface. [15][16][17] The decay lengths have been reported to be in the range of a few nanometers and depend on the size, shape, and composition of the nanostructure. [18,19] Recently, we developed a process termed on-wire lithography (OWL) [20] for the construction of nanostructures from one-dimensional wires by using a template synthesis method. [21][22][23][24] OWL allows rod and disk structures to be made with sub-5 nm to many micrometers feature size. Importantly, it allows generation of nanostructures over different compositions adjacent to one another. Therefore, OWL allows important distance-dependent phenomena in many areas to be probed, [25,26] including molecular electronics, catalysis, spectroscopy, and optics. Indeed, it is an excellent test bed for probing some of the fundamental underpinnings of the SERS phenomenon.Herein, we describe how OWL can be used to fabricate nanostructures made of gold that have excitable plasmon resonances in the visible region of the spectrum (632.8 nm), and which are separated by nanometer-scale distances from nickel segments that do not have such plasmon resonances but can be selectively modified with Raman-active probes. We have discovered that disklike gold nanostructures can be separated from the nickel segments by 120 nm and can still exhibit enhanced Raman scattering using the Raman probes, although the probes are only localized on the nickel segment. This is an unprecedented example of long-range SERS. This long-range surface enhancement constitutes a method for using plasmon excitation to enhance photoprocesses over distances that are relevant to applications in chemical and biological sensing.In a typical experiment, OWL is used to fabricate a 360 nm diameter multisegmented nanowire containing: 1) a 1.5 mm segment of gold, 2) a 1.5 mm gap, 3) a pair of (120 AE 18) nm long gold nanodisks that are separated by a (30 AE 10) nm gap (termed a gold nanodisk pair), and 4) a 1.5 mm nickel wire segment that is separated by a (120 AE 13) nm gap from the gold nanodisk pair (Figure 1 a, left to right). The 120 nm gold disk thickness and 30 nm gap distance were chosen based upon previous results from our group that show a near-ideal geometry for obtaini...

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Selective Functionalization of Two-Component Magnetic Nanowires

Cited by 76 publications

References 29 publications

Magnetic Nanotube Fabrication by Using Bacterial Magnetic Nanocrystals

Magnetic Nanotube Fabrication by Using Bacterial Magnetic Nanocrystals

Vielsegmentige Nanostäbe: Templatsynthese und Eigenschaften

Surprisingly Long‐Range Surface‐Enhanced Raman Scattering (SERS) on Au–Ni Multisegmented Nanowires

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