Size-Dependent Chemistry: Properties of Nanocrystals

Rao, C. N. R.; Kulkarni, G. U.; Thomas, P. John; Edwards, Peter P.

doi:10.1142/9789812835734_0021

Cited by 51 publications

(64 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…4, XPS spectra of the NWs before (that is, with S, black curve) and after the oxygen plasma/HF treatment (that is, treated, blue curve) are all calibrated with the C1s peak. The relatively small shifting of the spectra might be attributed to size effect as reported in the literatures [37][38][39] , which is not emphasized herein. The NWs grown without the sulfur surfactant are also measured as the control sample (that is, no S, red curve).…”

Section: Resultsmentioning

confidence: 64%

Surfactant-assisted chemical vapour deposition of high-performance small-diameter GaSb nanowires

et al. 2014

View full text Add to dashboard Cite

Although various device structures based on GaSb nanowires have been realized, further performance enhancement suffers from uncontrolled radial growth during the nanowire synthesis, resulting in non-uniform and tapered nanowires with diameters larger than few tens of nanometres. Here we report the use of sulfur surfactant in chemical vapour deposition to achieve very thin and uniform GaSb nanowires with diameters down to 20 nm. In contrast to surfactant effects typically employed in the liquid phase and thin-film technologies, the sulfur atoms contribute to form stable S-Sb bonds on the as-grown nanowire surface, effectively stabilizing sidewalls and minimizing unintentional radial nanowire growth. When configured into transistors, these devices exhibit impressive electrical properties with the peak hole mobility of B200 cm 2 V À 1 s À 1 , better than any mobility value reported for a GaSb nanowire device to date. These factors indicate the effectiveness of this surfactant-assisted growth for high-performance small-diameter GaSb nanowires.

show abstract

Section: Resultsmentioning

confidence: 64%

Surfactant-assisted chemical vapour deposition of high-performance small-diameter GaSb nanowires

et al. 2014

View full text Add to dashboard Cite

show abstract

“…In addition to the large surface-to-volume ratios, the surface, interface, and quantum effects take on a significance that is normally inconsequential for bulk materials. Varieties of physical properties such as mechanical strength, plasticity [8], sintering and alloying ability [9], diffusivity [10], chemical reactivity [11,12], as well as the mode of crystal growth (self-assembly) have been found to be dependent upon particle size. Property tunability also includes thermodynamics (critical temperatures for phase transitions such as liquidation, evaporation, and heat transport), lattice dynamics (optical and acoustic modes of lattice vibration), optics (photoemission and absorption) [13e15], electronics (work function, energy-level positions, electronephonon coupling) [16,17], magnetic (magnetization tailoring or enhancement) and dielectric performance.…”

Section: Overviewmentioning

confidence: 99%

Size dependence of nanostructures: Impact of bond order deficiency

Sun

2007

Progress in Solid State Chemistry

816

717

View full text Add to dashboard Cite

“…The first peak is assigned due to the band gap transitions, while the second one is due to sulfur vacancy in the CdS nanoparticles. At nanometric sizes, quantum confinement effects come into play and affect most notably the electronic properties [24]. Therefore, the perceptible attention has been paid to prevent the agglomeration of CdS particles in order to improve their photoluminescence properties.…”

Section: Optical Analysismentioning

confidence: 99%

Synthesis, Structural and Optical Properties of PVP Encapsulated CdS Nanoparticles

Saravanan

Diwakar

Mohankumar

et al. 2011

Nanomaterials and Nanotechnology

View full text Add to dashboard Cite

Highly monodispersed CdS nanoparticles using polyvinyl pyrrolidone (PVP) as the capping agent were synthesised by chemical coprecipitation method. The surface-modified cadmium sulfide nanoparticles were found to be remarkably stable. In the presence of PVP, cubic phase with small grain size of CdS were observed in XRD. The peaks were identified to originate from (111), (220) and (311) planes of CdS, respectively. The crystallite size of the synthesised CdS nanoparticles was about 3 nm calculated from the (111) plane of XRD pattern and it was also confirmed through HRTEM. Morphology and elemental mapping of the synthesised nanoparticles were studied by SEM and EDX analyses. Increase in the band gap with decrease in the particle size was observed from the reflectance mode UV spectrum, which confirms the quantum confinement effect. From the photoluminescence studies, enhanced near-band-edge blue light emission and significantly reduced defect-related green emission were observed. Longitudinal optical (LO) phonon modes, corresponds to pure CdS were observed in Raman spectrum.

show abstract

Size-Dependent Chemistry: Properties of Nanocrystals

Cited by 51 publications

References 0 publications

Surfactant-assisted chemical vapour deposition of high-performance small-diameter GaSb nanowires

Surfactant-assisted chemical vapour deposition of high-performance small-diameter GaSb nanowires

Size dependence of nanostructures: Impact of bond order deficiency

Synthesis, Structural and Optical Properties of PVP Encapsulated CdS Nanoparticles

Contact Info

Product

Resources

About