Binary Nanoparticle Superlattices in the Semiconductor−Semiconductor System:  CdTe and CdSe

Chen, Zhuoying; Moore, Jenny; Radtke, Guillaume; Sirringhaus, Henning; O’Brien, Stephen

doi:10.1021/ja076698z

Cited by 126 publications

(166 citation statements)

References 64 publications

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“…12,15,37 Although the presence of uncertainty of the precise value of A, the A value is several times larger than thermal energy k B T for metal nanoparticles dispersed in a good solvent with low dielectric constant, such as toluene used here. 12,15 ■ CONCLUSIONS…”

Section: Chemistry Of Materialsmentioning

confidence: 92%

Metal–Metal Binary Nanoparticle Superlattices: A Case Study of Mixing Co and Ag Nanoparticles

2015

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Here, Co/Ag binary nanoparticle superlattices were engineered. It is demonstrated that the Ag/Co nanoparticle size ratio is the dominating factor in the formation of binary nanoparticle superlattices. However, regardless of the relative ratio concentration of Co and Ag nanoparticles, the deposition temperature, T d markedly changes the crystalline structure of binary superlattices. A systematic study of these parameters is presented in order to shed light on the driving force in the formation of binary metallic nanoparticle superlattices. For metal Co and Ag nanoparticles, the interparticle potential pairs are considered to be strong, but entropy is still the main driving force for the assembling into binary nanoparticle superlattices, rather than the energy arising from the interparticle interactions. ■ INTRODUCTIONSpontaneous self-assembly has been universally studied with building blocks from atoms to micrometer-sized colloids, and has been extended to particles at the nanoscale in the last two decades. 1−4 During the past decade, considerable effort has been put into the design and fabrication of metallic metamaterials that are known to be a generation of advanced materials exhibiting unique chemical and physical properties. 5−8 The formation of single-component metal nanoparticle superlattices is rather well understood, and the structure of superlattices can be controlled, from face-centered cubic (fcc) to body-centered cubic (bcc) and hexagonal-closest packed (hcp) structures. 9 At the same time, less effort has been devoted to the systematic studies of the phase control of binary metal nanoparticle superlattices. 10 Recently, binary nanoparticle superlattices containing two distinct nanoparticles have been discovered, and a wide variety of crystal structures, analogous to structures of binary atomic alloys, have been demonstrated. 11−14 Despite the previous systematic investigation of the self-assembly of binary nanoparticle mixtures, i.e., semiconductor−semiconductor, 15−17 semiconductor−metal, 10,18 and metal−oxide system, 11 in which it is intuitive to probe the intrinsic driving force for the nanoscale assembly, the combination of two metal-type nanoparticles is quite limited. 19,20 Recent simulation of the attraction energy between dispersed nanoparticles shows that the pair energy between two metal nanoparticles is about 5 k B T at room temperature with 1 nm capping shell thickness, whereas it is below 1 k B T for semiconductor nanoparticles. 21 This strong attractive van der Waals force for metal nanoparticles is due to the fact that dipole−dipole interactions are relatively strong, despite organic coating on their surface.Actually, the formation of binary nanoparticle superlattices is highly dependent on the kinds of the nanoparticles, typically of metallic or nonmetallic. 10 Binary systems with nonmetallic nanoparticles can result in NaCl-type, AlB 2 -type, and NaZn 13 -type structures, and these phases also exist in nature opals called hard spheres, which is regardless the surface interactions ...

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Section: Chemistry Of Materialsmentioning

confidence: 92%

Metal–Metal Binary Nanoparticle Superlattices: A Case Study of Mixing Co and Ag Nanoparticles

2015

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“…Recently, binary nanoparticle superlattices based on metallic [44], or a combination of metallic and semiconductor building blocks were reported [24,45]. Binary superlattices combining PbTe and Ag 2 Te [46], and CdSe and CdTe nanocrystals (NC) [47,48] have also been reported recently.…”

Section: Introductionmentioning

confidence: 99%

Fluorescent superlattices of gold nanoparticles: A new class of functional materials

et al. 2009

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Fluorescent three-dimensional (3-D) superlattices of dansyl glutathione protected gold nanoparticles, with potential applications in molecular detection, have been synthesized at an air/water interface by controlling the pH of the nanoparticle suspension. The number of fl uorophores per nanoparticle was calculated to be ~127. Morphologies of the superlattice crystals were examined using scanning electron microscopy (SEM). Most of the crystals observed were triangular in shape. High-resolution transmission electron microscopy (HRTEM) and small angle X-ray scattering (SAXS) were used to study the packing of nanoparticles in these crystals. Both these studies showed that the nanoparticles were arranged in a face-centered cubic (fcc) pattern with a particle-particle distance (center-center) of ~10.5 nm. Evolution of the crystal morphologies with time was also examined. The fl uorescence properties of these triangles were studied using confocal fl uorescence imaging and confocal Raman mapping, which were in good agreement with the morphologies observed by SEM. The superlattice exhibits near-infrared (NIR) absorption in the range 1100-2500 nm. Easy synthesis of such functional nanoparticle-based solids makes it possible to use them in novel applications. We utilized the fl uorescence of dansyl glutathione gold superlattice crystals for the selective detection of bovine serum albumin (BSA), the major protein constituent of blood plasma, based on the selective binding of the naphthalene ring of the dansyl moiety with site I of BSA.

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“…(22) This phenomenon is often observed with gold nanoparticles functionalized with saturated alkylthiols due to the enthalphic gain by the packing of long alkyl chains. (23–26) The uniform dispersion of nanoparticles depicted in Figure 1d is often achieved in athermal nanoparticle–polymer mixtures where nanoparticles are grafted with the same polymer as the micelle core. (21, 22) The intermediate interaction between the two extreme cases is expected to result in anisotropic assemblies of nanoparticles into one- or two-dimensional arrays.…”

Section: Introductionmentioning

confidence: 99%

Low-Dimensional Nanoparticle Clustering in Polymer Micelles and Their Transverse Relaxivity Rates

et al. 2013

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One- or two-dimensional arrays of iron oxide nanoparticles were formed in colloidal assemblies of amphiphilic polymers. Electron tomography imaging revealed that nanoparticles are arranged into one-dimensional strings in magneto-micelles or two-dimensional sheets in magneto-core/shell assemblies. The distinct directional assembly behavior was attributed to the interparticle interaction relative to the nanoparticle–polymer interaction, which was modulated by varying the cosolvent used for the solution phase self-assembly. Magneto-core/shell assemblies with varying structural parameters were formed with a range of different sized as-synthesized nanoparticles. The transverse magnetic relaxivity rates (r2) of a series of different assemblies were determined to examine the effect of nanoparticle arrangement on the magnetic relaxivity for their potential applications in MRI. The results indicated that the assembly structure of nanoparticles in polymer micelles significantly affects the r2 of surrounding water, providing a way to control magnetic relaxivity.

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Binary Nanoparticle Superlattices in the Semiconductor−Semiconductor System: CdTe and CdSe

Cited by 126 publications

References 64 publications

Metal–Metal Binary Nanoparticle Superlattices: A Case Study of Mixing Co and Ag Nanoparticles

Metal–Metal Binary Nanoparticle Superlattices: A Case Study of Mixing Co and Ag Nanoparticles

Fluorescent superlattices of gold nanoparticles: A new class of functional materials

Low-Dimensional Nanoparticle Clustering in Polymer Micelles and Their Transverse Relaxivity Rates

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