Large-scale fabrication of uniform gold nanoparticles in ultrahigh vacuum

Xu, Xiangdong; Wang, Y.C.; Liu, Zhongfan

doi:10.1016/j.jcrysgro.2005.08.048

Cited by 9 publications

(7 citation statements)

References 28 publications

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“…Smaller and more uniform AuNPs, other than those in Figure 2a and b , were formed on the MPTMS surface (Figure 3a ). This is attributed to stronger Au-SR bonds (165kJ/mol) between Au and MPTMS [ 25 ], further confirming our prediction about the effects of interaction on the growth.…”

Section: Resultssupporting

confidence: 88%

“…We further investigated the preparation of AuNPs by self assembly in UHV. In this experiment, we first prepared a 3-mercaptopropyltrimethoxysilane (MPTMS) self-assembled monolayer (SAM) on a Si(111) substrate, and then vaporized Au by EBE in UHV onto the MPTMS surface [ 25 ]. Figure 3 reveals that AuNPs with diameters of 3 to 8nm (Figure 3b ) and particle density of 1.37 × 10 12 cm −2 were formed and distributed uniformly and densely.…”

Section: Resultsmentioning

confidence: 99%

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Silicon nanowires prepared by electron beam evaporation in ultrahigh vacuum

Wang

et al. 2012

Nanoscale Res Lett

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One-dimensional silicon nanowires (SiNWs) were prepared by electron beam evaporation in ultrahigh vacuum (UHV). The SiNWs can be grown through either vapor–liquid-solid (VLS) or oxide-assisted growth (OAG) mechanism. In VLS growth, SiNWs can be formed on Si surface, not on SiO2 surfaces. Moreover, low deposition rate is helpful for producing lateral SiNWs by VLS. But in OAG process, SiNWs can be grown on SiO2 surfaces, not on Si surfaces. This work reveals the methods of producing large-scale SiNWs in UHV.

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Section: Resultssupporting

confidence: 88%

Section: Resultsmentioning

confidence: 99%

Silicon nanowires prepared by electron beam evaporation in ultrahigh vacuum

Wang

et al. 2012

Nanoscale Res Lett

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“…There are several experimental methods to generate bimetallic NPs, which in general can be divided into two groups: dry and wet. Dry methods 7 refer to the formation of clusters under vacuum conditions inside a source commonly containing a mass-selector. Then, the decrease in temperature inside the chamber leads to condensation of the particles, with the formation of several nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic considerations and computer simulations on the formation of core-shell nanoparticles under electrochemical conditions

Oviedo

Leiva

Mariscal

2008

Phys. Chem. Chem. Phys.

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We report on thermodynamic modeling and computer simulations on the electrochemical generation of metallic and bimetallic nanoparticles (NPs) by means of quenched molecular dynamics (QMD). The present results suggest that the spontaneous formation of core-shell NPs depends on several factors, i.e. size and shape of the core, chemical composition of the system, and under-/oversaturation conditions. Homo- and heteroatomic prototypical systems were considered. The former systems were Au and Pt. The latter were Ag(core)/Au(shell), Pt(core)/Au(shell), Au(core)/Ag(shell) and Au(core)/Pt(shell).

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“…19 These studies are distinct from those of simple deposition of AuNPs on a surface. [20][21][22] The chemistry of AuNPs immobilization is classied as an electrostatic interaction, 11,[23][24][25][26][27] S-Au bonds, 11,23,[27][28][29][30][31] other covalent bonds, 13,32 or hydrophobic interactions. 19 In many reports, the surfaces of glass and Si substrates are functionalized with various silane coupling agents to create interactions between AuNPs and the functionalized surfaces.…”

Section: Introductionmentioning

confidence: 99%