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1.
Chem Commun (Camb) ; 54(31): 3831-3834, 2018 Apr 12.
Article in English | MEDLINE | ID: mdl-29564428

ABSTRACT

Black phosphorus is a two-dimensional material that has potential applications in energy storage, high frequency electronics and sensing, yet it suffers from instability in oxygenated and/or aqueous systems. Here we present the use of a polymeric stabilizer which prevents the degradation of nearly 68% of the material in aqueous media over the course of ca. 1 month.

2.
ACS Appl Mater Interfaces ; 10(12): 10330-10338, 2018 Mar 28.
Article in English | MEDLINE | ID: mdl-29504393

ABSTRACT

Two-dimensional materials show considerable promise as high surface area electrodes for energy-storage applications such as supercapacitors. A single sheet of graphene possesses a large specific surface area because of its atomically thin thickness. However, to package this area efficiently in a device, it must be confined within a finite three-dimensional volume without restacking of the sheet faces. Herein, we present a method of maintaining the high surface area through the use of a hybrid thin film in which few-layer-exfoliated black phosphorus (BP) reduces graphene oxide (GO) flakes. When the film is exposed to moisture, a redox reaction between the BP and the GO forms an interpenetrating network of reduced GO (RGO) and a liquid electrolyte of intermediate phosphorus acids H xPO y. The presence of the liquid H xPO y electrolyte in the RGO/H xPO y film stabilizes and preserves an open-channel structure enabling rapid ion diffusion, leading to an excellent charging rate capability (up to 500 mV s-1 and retaining 62.3% of initial capacitance at a large current density of 50 A g-1) when used as electrodes in supercapacitors.

3.
Chem Commun (Camb) ; 53(9): 1445-1458, 2017 Jan 26.
Article in English | MEDLINE | ID: mdl-28054045

ABSTRACT

Phosphorene, or two-dimensional (2D) black phosphorus (BP) was the first synthetic 2D elemental allotrope beyond graphene to be isolated and studied. It is useful due to its high p-type carrier mobility and direct band gap that is tunable in the range ca. 0.3-2 eV thus bridging the energy gap between graphene and transition metal dichalcogenides such as molybdenum disulfide. Beyond the 'Scotch-Tape' method that was used to isolate the first samples of 2D BP for prototype studies, a range of potentially scalable solution processing techniques emerged later that can produce electronics grade material. This feature article focuses on such solution-process routes to 2D BP and highlights challenges in processing the material, mainly caused by its susceptibility to oxidation, as well as illuminating new avenues and opportunities in the area.

4.
ACS Appl Mater Interfaces ; 8(35): 22860-8, 2016 Sep 07.
Article in English | MEDLINE | ID: mdl-27508925

ABSTRACT

We report the electrochemical detection of the redox active cardiac biomarker myoglobin (Mb) using aptamer-functionalized black phosphorus nanostructured electrodes by measuring direct electron transfer. The as-synthesized few-layer black phosphorus nanosheets have been functionalized with poly-l-lysine (PLL) to facilitate binding with generated anti-Mb DNA aptamers on nanostructured electrodes. This aptasensor platform has a record-low detection limit (∼0.524 pg mL(-1)) and sensitivity (36 µA pg(-1) mL cm(-2)) toward Mb with a dynamic response range from 1 pg mL(-1) to 16 µg mL(-1) for Mb in serum samples. This strategy opens up avenues to bedside technologies for multiplexed diagnosis of cardiovascular diseases in complex human samples.


Subject(s)
Nanostructures , Aptamers, Nucleotide , Biomarkers , Biosensing Techniques , Cardiovascular Diseases , Electrochemical Techniques , Electrodes , Humans , Myoglobin , Phosphorus
5.
Adv Mater ; 28(37): 8256-8264, 2016 Oct.
Article in English | MEDLINE | ID: mdl-27461734

ABSTRACT

The polarizable organic/water interface is used to construct MoS2 /graphene nanocomposites, and various asymmetrically dual-decorated graphene sandwiches are synthesized. High-resolution transmission electron microscopy and 3D electron tomography confirm their structure. These dual-decorated graphene-based hybrids show excellent hydrogen evolution activity and promising capacitance performance.

6.
J Am Chem Soc ; 137(39): 12689-96, 2015 Oct 07.
Article in English | MEDLINE | ID: mdl-26352047

ABSTRACT

The liquid-phase exfoliation of tin(II) sulfide to produce SnS nanosheets in N-methyl-2-pyrrolidone is reported. The material is characterized by Raman spectroscopy, atomic force microscopy, lattice-resolution scanning transmission electron microscope imaging, and energy dispersive X-ray spectrum imaging. Quantum chemical calculations on the optoelectronic characteristics of bulk and 10-layer down to monolayer SnS have been performed using a quantum chemical density functional tight-binding approach. The optical properties of the SnS and centrifugally fractionated SnS nanosheet dispersions were compared to that predicted by theory. Through centrifugation, bilayer SnS nanosheets can be produced size-selectively. The scalable solution processing of semiconductor SnS nanosheets is the key to their commercial exploitation and is potentially an important step toward the realization of a future electronics industry based on two-dimensional materials.

7.
Chem Commun (Camb) ; 50(87): 13338-41, 2014 Nov 11.
Article in English | MEDLINE | ID: mdl-25231502

ABSTRACT

We report the liquid exfoliation of black phosphorus in N-methyl-2-pyrrolidone to form few-layer phosphorene nanosheets.

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