Size-dependent change in the<i>d</i>bands of Cu particles

Anno, E.; Tanimoto, M.; Yamaguchi, Tomuo

doi:10.1103/physrevb.38.3521

Cited by 17 publications

(9 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This result agrees with the observed behavior of the enhanced magnetic moments in free-standing Fe particles. 15 Also, modifications of the band structure have been reported in Cu particles 16 and in the optical properties of Cu/Pt particles 17 of similar sizes to the Fe particles reported here.…”

Section: Discussionsupporting

confidence: 77%

Optical and magneto-optical properties of Fe nanoparticles

Menéndez¹,

Bescós²,

Armelles³

et al. 2002

Phys. Rev. B

View full text Add to dashboard Cite

The optical and magneto-optical properties of Fe nanoparticles with sizes ranging from 2 to 8 nm, embedded in amorphous Al 2 O 3 , are studied as a function of their size and shape. The optical properties were measured using spectroscopic ellipsometry, whereas the magneto-optical properties were determined in two different Kerr configurations: polar and transverse. A generalization of different effective medium approximations is used to describe and analyze experimental data in nanocomposite media. In this generalization, the shapes of the nanoparticles are considered as an input parameter. The optical and magneto-optical parameters show clearly different values as a function of the nanoparticle size. A reasonable agreement between the theoretical calculations and experimental data is found when the average size of the nanoparticles is larger than 4 nm. On the other hand, the experimental and theoretical curves differ for smaller sizes, implying that below 4 nm the optical and magneto-optical constants of the particles deviate from the bulk behavior.

show abstract

Section: Discussionsupporting

confidence: 77%

Optical and magneto-optical properties of Fe nanoparticles

Menéndez¹,

Bescós²,

Armelles³

et al. 2002

Phys. Rev. B

View full text Add to dashboard Cite

show abstract

“…It has been reported that copper nanoparticles have a characteristic absorption plasmon peak at ca. 570 nm . Interestingly, the UV−visible spectrum of Cu nanoparticles prepared herein does not show the presence of such a plasmon; however, this is not inconsistent with the formation of copper nanoparticles for two reasons.…”

mentioning

confidence: 54%

Ultrasmall Copper Nanoparticles from a Hydrophobically Immobilized Surfactant Template

et al. 2009

View full text Add to dashboard Cite

Ultrasmall copper nanoparticles are produced by N,N,N',N'-tetramethyl-p-phenylenediamine (TMPDA) reduction of aqueous Cu(2+) on a hydrophobically immobilized sodium dodecylbenzenesulfonate (SDBS) surfactant template in the presence of sodium citrate at room temperature. Single-walled carbon nanotubes (SWNTs) act as a scaffold controlling the size of the SDBS micelle, which in turn confines a limited number of copper ions near the nanotube surface. TMPDA reduction forms copper nanoparticles as confirmed by X-ray photoelectron spectroscopy and electron diffraction, whose size was determined by atomic force microscopy and transmission electron microscopy to be approximately 2 nm. Particles formed in the absence of the SWNT immobilizer range from 2 to 150 nm.

show abstract

“…The absorption measurements of the particles can be evaluated by using Mie theory [46] and its expanded versions [47,48]. For spherical particles having a 10 nm diameter, the absorption spectra are characterized by a plasmon peak [49][50][51]. Colloidal Ag is useful for studying the electronic changes that occur upon chemical modification of the surface.…”

Section: Xrd Measurementsmentioning

confidence: 99%

Gamma Radiolytic Formation of Alloyed Ag‐Pt Nanocolloids

Temgire

Bellare

Joshi

2011

Advances in Physical Chemistry

View full text Add to dashboard Cite

Colloidal dispersions of Ag-Pt composite nanoparticles were prepared by gamma radiolysis technique in the presence of nonionic surfactant Brij'97. Simultaneous as well as sequential reduction methods were employed in order to study the structural formation of Ag-Pt bimetallic clusters. Similar shape and trend was observed in optical spectra for both methods. Radiolysis yielded nearly spherical Ag-Pt bimetallic clusters by use of AgNO3 instead of AgClO4. The disappearance of the silver resonance and the simultaneous growth of the 260 nm resonance are independent of cluster structure and degree of alloying. To understand formation of Ag-Pt aggregate, the optical studies were also done as a function of amount of dose absorbed, concentration of surfactant, that is, Brij'97. The shape of the absorption spectrum did not change with increase in gamma radiation dose. TEM analysis exhibited fine dispersions of Ag-Pt clusters surrounded by a mantle when capped with Brij'97. The particle size obtained was in the range of 5–9 nm. On the basis of optical, XRD, and TEM analysis, alloy formation is discussed.

show abstract

Size-dependent change in thedbands of Cu particles

Cited by 17 publications

References 10 publications

Optical and magneto-optical properties of Fe nanoparticles

Optical and magneto-optical properties of Fe nanoparticles

Ultrasmall Copper Nanoparticles from a Hydrophobically Immobilized Surfactant Template

Gamma Radiolytic Formation of Alloyed Ag‐Pt Nanocolloids

Contact Info

Product

Resources

About