Black phosphorus quantum dots.

Black phosphorus quantum dots.

Angewandte Chemie (International ed. in English) (2015-02-05)

Xiao Zhang, Haiming Xie, Zhengdong Liu, Chaoliang Tan, Zhimin Luo, Hai Li, Jiadan Lin, Liqun Sun, Wei Chen, Zhichuan Xu, Linghai Xie, Wei Huang, Hua Zhang

PMID25649505

ABSTRACT

As a unique two-dimensional nanomaterial, layered black phosphorus (BP) nanosheets have shown promising applications in electronics. Although mechanical exfoliation was successfully used to prepare BP nanosheets, it is still a challenge to produce novel BP nanostructures in high yield. A facile top-down approach for preparation of black phosphorus quantum dots (BPQDs) in solution is presented. The obtained BPQDs have a lateral size of 4.9±1.6 nm and thickness of 1.9±0.9 nm (ca. 4±2 layers). As a proof-of-concept application, by using BPQDs mixed with polyvinylpyrrolidone as the active layer, a flexible memory device was successfully fabricated that exhibits a nonvolatile rewritable memory effect with a high ON/OFF current ratio and good stability.

MATERIALS

Product Number

Brand

Product Description

328634

Sigma-Aldrich

1-Methyl-2-pyrrolidinone, anhydrous, 99.5%

78769

Supelco

1-Methyl-2-pyrrolidinone, analytical standard

87369

Supelco

Tetrahydrofuran, Selectophore^™, ≥99.5%

186562

Sigma-Aldrich

Tetrahydrofuran, anhydrous, contains 250 ppm BHT as inhibitor, ≥99.9%

401757

Sigma-Aldrich

Tetrahydrofuran, anhydrous, ≥99.9%, inhibitor-free

644544

Sigma-Aldrich

Tetrahydrofuran, inhibitor-free, purification grade

78445

Supelco

Tetrahydrofuran, analytical standard

PHR1561

Supelco

Tetrahydrofuran, Pharmaceutical Secondary Standard; Certified Reference Material

270458

Sigma-Aldrich

1-Methyl-2-pyrrolidinone, suitable for HPLC, ≥99%

M79603

Sigma-Aldrich

1-Methyl-2-pyrrolidinone, ReagentPlus^®, 99%

178810

Sigma-Aldrich

Tetrahydrofuran, ≥99.0%, contains 200-400 ppm BHT as inhibitor, ReagentPlus^®

360589

Sigma-Aldrich

Tetrahydrofuran, contains 200-400 ppm BHT as inhibitor, ACS reagent, ≥99.0%

494496

Sigma-Aldrich

1-Methyl-2-pyrrolidinone, biotech. grade, ≥99.7%

676764

Sigma-Aldrich

Tetrahydrofuran, ACS reagent, ≥99.0%, contains 200-400 ppm BHT as inhibitor

87368

Sigma-Aldrich

Tetrahydrofuran, contains 250 ppm BHT as inhibitor, puriss. p.a., ACS reagent, reag. Ph. Eur., ≥99.9%

443778

Sigma-Aldrich

1-Methyl-2-pyrrolidinone, ACS reagent, ≥99.0%

34865

Sigma-Aldrich

Tetrahydrofuran, inhibitor-free, suitable for HPLC, ≥99.9%

676853

Sigma-Aldrich

Dichloromethane, ACS reagent, ≥99.5%, contains 40-150 ppm amylene as stabilizer

760404

Tantalum(V) ethoxide, packaged for use in deposition systems

66742

Supelco

Dichloromethane, Selectophore^™, ≥99.5%

339113

Sigma-Aldrich

Tantalum(V) ethoxide, 99.98% trace metals basis

270997

Sigma-Aldrich

Dichloromethane, anhydrous, ≥99.8%, contains 40-150 ppm amylene as stabilizer

PHR1557

Supelco

Methylene Chloride, Pharmaceutical Secondary Standard; Certified Reference Material

32222

Sigma-Aldrich

Dichloromethane, puriss. p.a., ACS reagent, reag. ISO, ≥99.9% (GC)

02575

Supelco

Dichloromethane, analytical standard

439223

Sigma-Aldrich

Dichloromethane, suitable for HPLC, ≥99.9%, contains 40-150 ppm amylene as stabilizer

D65100

Sigma-Aldrich

Dichloromethane, contains 40-150 ppm amylene as stabilizer, ACS reagent, ≥99.5%

320269

Sigma-Aldrich

Dichloromethane, ACS reagent, ≥99.5%, contains 40-150 ppm amylene as stabilizer

24233

Sigma-Aldrich

Dichloromethane, puriss., meets analytical specification of Ph. Eur., NF, ≥99% (GC)

494453

Sigma-Aldrich

Dichloromethane, biotech. grade, 99.9%, contains 40-150 ppm amylene as stabilizer