From Dots to Stripes to Sheets: Shape Control of Lead Sulfide Nanostructures

Bielewicz, Thomas; Moayed, Mohammad Mehdi Ramin; Lebedeva, Vera; Strelow, Christian; Rieckmann, Angelique; Klinke, Christian

doi:10.1021/acs.chemmater.5b03088

Cited by 32 publications

(56 citation statements)

References 51 publications

(108 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…8,9,10,11,18,19 Here, we demonstrated that amines and aliphatic fluorides are also suitable for the growth of twodimensional lead sulfide shapes at reaction temperatures of 170 °C. By omitting the coligand, the only ligand left in the solution is oleic acid.…”

Section: Oleic Acid As Sole Ligandmentioning

confidence: 78%

“…10 With HA this transition between nanosheets and stripes takes place at lower concentrations of HA and the product changes already from nanosheets at 0.7 mmol of HA to stripe-like agglomerates at 2.9 mmol.…”

Section: C7 Ligandsmentioning

confidence: 97%

“…10 We performed the experiments also with -8-the other alkane coligands with lengths comparable to the length of the main ligand, oleic acid. All results are shown in Figure 4.…”

Section: C14 Ligandsmentioning

confidence: 99%

“…8,9,10,11 Recently, we could show that different chloroalkanes can lead to similar lead sulfide nanosheets and only the reaction temperature or the amount of the chloroalkane plays a role for the formation of two-dimensional nanocrystals. 10 An interplay between oleic acid/oleate and the chloroalkane with the crystal facets of lead sulfide was identified as the main reason for small lead sulfide nanocrystals to merge via oriented attachment rather than to form individual spherical or cubic nanoparticles. 11 The reason why the growth to laterally large sheets with thicknesses smaller than the Bohr radius of PbS should be exclusive to the use of chloroalkanes is not investigated until now.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

New ways to synthesize lead sulfide nanosheets—substituted alkanes direct the growth of 2D nanostructures

Bielewicz¹,

Klein²,

Klinke³

2016

Nanotechnology

Self Cite

View full text Add to dashboard Cite

show abstract

Section: Oleic Acid As Sole Ligandmentioning

confidence: 78%

Section: C7 Ligandsmentioning

confidence: 97%

“…10 We performed the experiments also with -8-the other alkane coligands with lengths comparable to the length of the main ligand, oleic acid. All results are shown in Figure 4.…”

Section: C14 Ligandsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

New ways to synthesize lead sulfide nanosheets—substituted alkanes direct the growth of 2D nanostructures

Bielewicz¹,

Klein²,

Klinke³

2016

Nanotechnology

Self Cite

View full text Add to dashboard Cite

show abstract

“…40,41 We observed that chlorinated additives are indispensable for the formation of two-dimensional PbS nanosheets. 40 We also observed that halogenated additives lead to a shape evolution from WZ-CdSe nanorods into pyramidal-shape nanoparticles.…”

mentioning

confidence: 92%

Size, Shape, and Phase Control in Ultrathin CdSe Nanosheets

Gerdes¹,

Navío

Juárez

et al. 2017

Nano Lett.

Self Cite

View full text Add to dashboard Cite

Ultrathin two-dimensional nanosheets raise a rapidly increasing interest due to their unique dimensionality-dependent properties. Most of the two-dimensional materials are obtained by exfoliation of layered bulk materials or are grown on substrates by vapor deposition methods. To produce free-standing nanosheets, solution-based colloidal methods are emerging as promising routes. In this work, we demonstrate ultrathin CdSe nanosheets with controllable size, shape and phase. The key of our approach is the use of halogenated alkanes as additives in a hot-injection synthesis. Increasing concentrations of bromoalkanes can tune the shape from sexangular to quadrangular to triangular and the phase from zinc blende to wurtzite. Geometry and crystal structure evolution of the nanosheets take place in the presence of halide ions, acting as cadmium complexing agents and as surface X-type ligands, according to mass spectrometry and X-ray photoelectron spectroscopies. Our experimental findings show that the degree of these changes depends on the molecular structure of the halogen alkanes and the type of halogen atom.Comment: 24 pages, 6 figure

show abstract

High‐Performance n‐ and p‐Type Field‐Effect Transistors Based on Hybridly Surface‐Passivated Colloidal PbS Nanosheets

Moayed

Bielewicz

Noei

et al. 2018

Adv Funct Materials

Self Cite

View full text Add to dashboard Cite

Colloidally synthesized nanomaterials are among the promising candidates for future electronic devices due to their simplicity and the inexpensiveness of their production. Specifically, colloidal nanosheets are of great interest since they are conveniently producible through the colloidal approach while having the advantages of two-dimensionality. In order to employ these materials, according transistor behavior should be adjustable and of high performance. It is shown that the transistor performance of colloidal lead sulfide nanosheets is tunable by altering the surface passivation, the contact metal, or by exposing them to air. It is found that adding halide ions to the synthesis leads to an improvement of the conductivity, the fieldeffect mobility, and the on/off ratio of these transistors by passivating their surface defects. Superior n-type behavior with a field-effect mobility of 248 cm 2 V −1 s −1 and an on/off ratio of 4 × 10 6 is achieved. The conductivity of these stripes can be changed from n-type to p-type by altering the contact metal and by adding oxygen to the working environment. As a possible solution for the post-Moore era, realizing new high-quality semiconductors such as colloidal materials is crucial. In this respect, the results can provide new insights which helps to accelerate their optimization for potential applications.

show abstract

From Dots to Stripes to Sheets: Shape Control of Lead Sulfide Nanostructures

Abstract: Controlling anisotropy in nanostructures is

Cited by 32 publications

References 51 publications

New ways to synthesize lead sulfide nanosheets—substituted alkanes direct the growth of 2D nanostructures

New ways to synthesize lead sulfide nanosheets—substituted alkanes direct the growth of 2D nanostructures

Size, Shape, and Phase Control in Ultrathin CdSe Nanosheets

High‐Performance n‐ and p‐Type Field‐Effect Transistors Based on Hybridly Surface‐Passivated Colloidal PbS Nanosheets

Contact Info

Product

Resources

About