Quantum dot self-assembly in liquid crystal media

Hirst, Linda S.; Kirchhoff, J.; Inman, Richard; Ghosh, Sayantani

doi:10.1117/12.848195

Cited by 34 publications

(24 citation statements)

References 13 publications

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“…1(i) and 1(j)]. The origin of light scattering centers can be understood by considering the fact that the dispersion of spherical and colloidal particles (such as cadmium sulphide QDs) into the LCs can introduce random surfaces which disrupt the uniformity of LC alignment [21,22]. The FLC alignment has affected remarkably by increasing the doping concentrations of CdTe QDs beyond 5 wt% which resulted in the form of degraded optical texture.…”

Section: Methodsmentioning

confidence: 99%

“…Shurpo et al have observed the fast reorientation of LC molecules from planar to homeotropic position by introducing the CdSe/ZnS QDs into LC mixture [20]. However, the studies based on LC/QDs composites are based on nematic LCs and have been rarely reported in ferroelectric liquid-crystal (FLC) materials [21,22]. Recently, we observed a pronounced memory effect in FLC mixtures by doping few wt% of CdTe QDs [23].…”

Section: Introductionmentioning

confidence: 99%

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Effect of cadmium telluride quantum dots on the dielectric and electro-optical properties of ferroelectric liquid crystals

Kumar

Biradar

2011

Phys. Rev. E

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We present here the dielectric and electro-optical studies of cadmium telluride quantum dots (CdTe QDs) doped ferroelectric liquid crystals (FLCs). It has been observed that the doping of CdTe QDs not only induced a pronounced memory effect but also affected the physical parameters of FLC material (LAHS19). The modifications in the physical parameters and memory effect of LAHS19 are found to depend on the concentration ratio of CdTe QDs. The lower concentration of CdTe QDs (1-3 wt%) enhanced the values of spontaneous polarization and rotational viscosity of LAHS19 material but did not favor the memory effect, whereas a higher concentration of CdTe QDs (>5 wt%) degraded the alignment of LAHS19 material. The doping of ∼5 wt% of CdTe QDs is found to be the most suitable for achieving good memory effect without significantly affecting the material parameters.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of cadmium telluride quantum dots on the dielectric and electro-optical properties of ferroelectric liquid crystals

Kumar

Biradar

2011

Phys. Rev. E

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“…16 On the other hand, the anisotropic ordering of LCs can impart order onto the nanosized guest particles and hence researchers have utilized this property to organize QDs in the form of their self-assembly. 17 Hirst et al 18 studied the mechanism to organize QDs by using anisotropic LC medium and explored the possibility for the fabrication of multifunctional switchable devices. However, the effect of QDs on the properties of LC materials is rarely reported.…”

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confidence: 99%

“…17 It has also been observed that the presence of large colloidal particles in LCs is usually associated with a defect in the texture. 18 The memory effect in CdTe-QDs doped various FLC material has been observed using dielectric measurements. Figure 3 shows the behavior of dielectric permittivity ͑Ј͒ with frequency at different dc biases of CdTe-QDs doped FLCs.…”

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confidence: 99%

Memory effect in cadmium telluride quantum dots doped ferroelectric liquid crystals

Kumar

Prakash

Khan

et al. 2010

Applied Physics Letters

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A pronounced memory effect has been observed in cadmium telluride quantum dots ͑CdTe-QDs͒ doped ferroelectric liquid crystals ͑FLCs͒ by using dielectric and electro-optical methods. The memory effect has been attributed to the charge storage on the CdTe-QDs upon the application of dc bias across the sample cell. The FLC molecules remain in the switched state in vicinity of the charge stored on QDs even after removal of bias. It has been observed that the memory effect depends on doping concentrations of CdTe-QDs and the FLC material used.

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“…108 In general, QD self-assembly in LCs depends on particle surface properties and concentration in the LC medium. The authors observed interesting structures and a phase behavior in nematic, cholesteric and smectic LCs by varying these parameters using both polarized optical and fluorescence microscopy.…”

Section: 98-101mentioning

confidence: 99%

Quantum dots as liquid crystal dopants

2012

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Liquid crystal nanoscience, a field exploring the mutually beneficial combination of the unique properties of nanoscale materials and fluid, yet ordered liquid crystalline phases, is increasingly focusing on semiconductor quantum dots. In one major research thrust, the anisotropic properties of the liquid crystal host are sought to facilitate the assembly of quantum dots into arrays, in another, both size-and shape-dependent optical and electronic properties of quantum dots are used to manipulate optical, electro-optical and alignment properties of liquid crystalline materials. This feature article reviews recent accomplishments and new insights in this fascinating area of soft matter nanocomposites including work from our laboratory on a series of CdSe and CdTe quantum dots as additives in nematic liquid crystal hosts.

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Quantum dot self-assembly in liquid crystal media

Cited by 34 publications

References 13 publications

Effect of cadmium telluride quantum dots on the dielectric and electro-optical properties of ferroelectric liquid crystals

Effect of cadmium telluride quantum dots on the dielectric and electro-optical properties of ferroelectric liquid crystals

Memory effect in cadmium telluride quantum dots doped ferroelectric liquid crystals

Quantum dots as liquid crystal dopants

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