Capping effect of CTAB on positively charged Ag nanoparticles

Sui, Zhenming; Chen, X.; Wang, L.Y.; Xu, Limei; Zhuang, Weihua; Chai, Yongcun; Yang, Chun

doi:10.1016/j.physe.2006.03.151

Cited by 189 publications

(108 citation statements)

References 71 publications

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“…From the values presented in table 1 we calculate a minimum CTA shell thickness of ≈1.0 nm. This value is in excellent agreement with the expected thickness of 1.0 nm-1.5 nm [17] reported elsewhere. The shift between the SE (blue) and BSHe (red) signal is a result of the well known orientation dependence in SE images.…”

Section: Discussionsupporting

confidence: 93%

“…Again this result is in excellent agreement with the expected CTA shell thickness of 1.0 nm-1.5 nm [17].…”

Section: Discussionsupporting

confidence: 87%

“…In the case discussed here, gold nano-rods are covered with an interdigiting double layer of cetyltrimethylammonium (CTA) which is formed during synthesis using CTA-bromide (CTAB). Comparison of Small Angle X-ray Scattering (SAXS) and Transmission Electron Microscopy (TEM) measurements revealed that the thickness of this shell is between 1.0 nm and 1.5 nm [17]-and thus less than the length of a single stretched CTA molecular ion of 2.2 nm [18].…”

Section: Introductionmentioning

confidence: 99%

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To see or not to see: Imaging surfactant coated nano-particles using HIM and SEM

et al. 2013

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Nano-particles are of great interest in fundamental and applied research. However, their accurate visualization is often difficult and the interpretation of the obtained images can be complicated. We present a comparative scanning electron microscopy and helium ion microscopy study of cetyltrimethylammoniumbromide (CTAB) coated gold nano-rods. Using both methods we show how the gold core as well as the surrounding thin CTAB shell can selectively be visualized. This allows for a quantitative determination of the dimensions of the gold core or the CTAB shell. The obtained CTAB shell thickness of 1.0 nm-1.5 nm is in excellent agreement with earlier results using more demanding and reciprocal space techniques.

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Section: Discussionsupporting

confidence: 93%

“…Again this result is in excellent agreement with the expected CTA shell thickness of 1.0 nm-1.5 nm [17].…”

Section: Discussionsupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

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To see or not to see: Imaging surfactant coated nano-particles using HIM and SEM

et al. 2013

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“…The single band located at 960 cm −1 on CTAB spectrum (Figure 3(a)) and the narrow one at 955 cm −1 (Figure 3(b)) for bounded CTAB may be assigned to the (C-N + ) stretching mode. The frequency shift may be caused by the interaction between (CH 3 ) 3 -N + group and the oxidized metal surface [40]. This type of interaction was also observed between the polymer hydroxypropyl cellulose (HPC) used as capping agent and the silver metal surface [41].…”

Section: Characterisationmentioning

confidence: 86%

Mn3O4 Nanoparticles: Synthesis, Characterization, and Dielectric Properties

Dhaouadi¹,

Ghodbane²,

Hosni

et al. 2012

ISRN Spectroscopy

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Mn 3 O 4 nanoparticles were prepared by a simple chemical route using cetyltetramethylammonium bromide (CTAB) as a template agent. Mn 3 O 4 nanocrystals present an octahedral shape, and their crystallite size varies between 20 and 80 nm. They were characterized by XRD, SEM, DTA/TG, and IR spectroscopy. XRD studies confirm the presence of a highly crystalline Mn 3 O 4 phase. The Rietveld refinement of the X-ray diffraction data confirms that Mn 3 O 4 nanoparticles crystallize in the tetragonal system with space group I41/amd. DTA/TG and XRD measurements demonstrate the phase transition toward a spinel structure between 25 and 700 • C. The electrical conductivity increases between 80 and 300 • C, suggesting a semiconducting behaviour of Mn 3 O 4 . Both dielectric dispersion (ε ) and dielectric loss (ε ) were investigated from 80 and 300 • C in the frequency range of 10 Hz-13 MHz. The dielectric properties showed typical dielectric dispersion based on the Maxwell-Wagner model.

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“…Figure 1 a shows a TEM image of spherical gold nanoparticles mean diameter 13 nm , employed as the cores of the fabricated gold/titania nanocomposites. The exceptional stability of the gold nanoparticle dispersion over the course of 1 year suggested an effective electrostatic stabilization by CTAB bilayers, which had formed on the metal surfaces 13 . When this gold nanoparticle dispersion was added to a mixture of 1-butanol/acetone mixture containing TTBO , thin titania shells formed around the metal surface, as shown in Figure 1 b .…”

Section: Resultsmentioning

confidence: 99%