A robust method for the synthesis of colloidal PbS nanosheets

Premathilaka, Shashini M.; Jiang, Zhoufeng; Antu, Antara Debnath; Leffler, Joey; Hu, Jianjun; Roy, Ajit K.; Sun, Lixing

doi:10.1002/pssr.201600294

Cited by 13 publications

(21 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To achieve absorption in the SWIR, narrow band gap materials 7,8 have to be used. PbS nanosheets 9,10 have been synthetized 11,12 and show tunable absorption 13 almost up to the bulk band gap value. 14 They also present a large lateral extension [15][16][17] (up to several µm) which is of great interest for the design of single-particle devices such as field effect transistors 18,19 (FETs) and photodetectors.…”

Section: Introductionmentioning

confidence: 99%

Impact of dimensionality and confinement on the electronic properties of mercury chalcogenide nanocrystals

et al. 2019

View full text Add to dashboard Cite

show abstract

Section: Introductionmentioning

confidence: 99%

Impact of dimensionality and confinement on the electronic properties of mercury chalcogenide nanocrystals

et al. 2019

View full text Add to dashboard Cite

show abstract

“…18,19 The confinement within the thickness of the NPLs or nanosheets enables tuning of the effective band gap from 0.41 eV up to 1 eV, while maintaining a high charge carrier mobility in the plane direction. 12,13,19,20 There are a few methods of the colloidal synthesis of anisotropic PbS nanomaterials mainly describing the fabrication of PbS nanosheets based on the oriented attachment of small PbS NCs 6,12,15,[21][22][23][24] or nanowires 25 into lateral expanded structures and single crystal honeycomb structures. 26 However, this field is not fully explored yet and there is plenty of potential for electronic and optical investigations arising from the 2D morphology.…”

Section: Introductionmentioning

confidence: 99%

Colloidal PbS nanoplatelets synthesized via cation exchange for electronic applications

et al. 2019

View full text Add to dashboard Cite

In this work, we present a new synthetic approach to colloidal PbS nanoplatelets (NPLs) utilizing a cation exchange (CE) strategy starting from CuS NPLs synthesized via the hot-injection method. Whereas the thickness of the resulting CuS NPLs was fixed at approx. 5 nm, the lateral size could be tuned by varying the reaction conditions, such as time from 6 to 16 h, the reaction temperature (120°C, 140°C), and the amount of copper precursor. In a second step, Cu + cations were replaced with Pb 2+ ions within the crystal lattice via CE. While the shape and the size of parental CuS platelets were preserved, the crystal structure was rearranged from hexagonal covellite to PbS galena, accompanied by the fragmentation of the monocrystalline phase into polycrystalline one. Afterwards a halide mediated ligand exchange (LE) was carried out in order to remove insulating oleic acid residues from the PbS NPL surface and to form stable dispersions in polar organic solvents enabling thin-film fabrication. Both CE and LE processes were monitored by several characterization techniques. Furthermore, we measured the electrical conductivity of the resulting PbS NPL-based films before and after LE and compared the processing in ambient to inert atmosphere. Finally, we fabricated field-effect transistors with an on/off ratio of up to 60 and linear charge carrier mobility for holes of 0.02 cm 2 V −1 s −1 . † Electronic supplementary information (ESI) available: Additional TEM images of cation and ligand exchanged NPLs, the results of ICP-OES and EDX analyses, additional absorption spectra and XRD pattern of intermediate samples taken during CE. See

show abstract

“…However, in the synthesis of colloidal PbS nanosheets, acetic acid causes aggregation of the nanosheets and ruins the synthesis. 24 A trace amount of acetate in the reaction solution leads to star-shaped nanocrystals during the synthesis of PbSe quantum dots. 25 In the synthesis of PbSe nanorods described by the reaction equation (eq 1), we reduced acetic acid and water from the reaction solution by degassing.…”

Section: ■ Experiments and Resultsmentioning

confidence: 99%

Branchless Colloidal PbSe Nanorods: Implications for Solution-Processed Optoelectronic and Thermoelectric Devices

Tang

Kandel

Jiang

et al. 2021

ACS Appl. Nano Mater.

Self Cite

View full text Add to dashboard Cite

Acetic acid causes branching of PbSe nanorods during the synthesis of colloidal PbSe nanorods. Removing acetic acid in the reaction solution prevents branching, resulting in uniform nanorods. It increases the photoluminescence quantum yield of the nanorods from 11% (branched) to 38% (branchless). The branchless nanorods exhibit single-exponential photoluminescence decay with a decay constant of 1.3 μs, in contrast to multiple-exponential photoluminescence decay in branched nanorods with an e-folding lifetime of 0.12 μs. The diameter of the nanorods can be tuned from 3.9 to 5.8 nm by changing the reaction temperature, resulting in an energy gap tunable from 0.88 to 0.65 eV. The dependence of the energy gap on the diameter follows the power law: diameter −1.5 . The superior optical properties, including long exciton lifetime, high photoluminescence quantum yield, and tunable energy gaps, make the branchless PbSe nanorods an excellent candidate material for thermoelectric and optoelectronic devices.

show abstract

A robust method for the synthesis of colloidal PbS nanosheets

Cited by 13 publications

References 40 publications

Impact of dimensionality and confinement on the electronic properties of mercury chalcogenide nanocrystals

Impact of dimensionality and confinement on the electronic properties of mercury chalcogenide nanocrystals

Colloidal PbS nanoplatelets synthesized via cation exchange for electronic applications

Branchless Colloidal PbSe Nanorods: Implications for Solution-Processed Optoelectronic and Thermoelectric Devices

Contact Info

Product

Resources

About