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Issue 8, 2019
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Direct covalent modification of black phosphorus quantum dots with conjugated polymers for information storage

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Abstract

It has long been recognized that a small switching bias window, which is defined as the difference between the switch-on and switch-off voltages (Δ|VONVOFF|), and a high ON/OFF current ratio would be greatly favorable to reduce the power consumption of memory devices and to decrease the information misreading rate in digital memory devices. In contrast to two-dimensional BP nanosheets, zero dimensional BP quantum dots (BPQDs) show more exciting physical and chemical properties. By using newly synthesized poly[(9,9-dioctyl-9H-fluorene)-alt-(4-(9H-carbazol-9-yl)aniline)] (PFCz-NH2) as the synthetic precursor, a highly soluble diazotated polymer, PFCz-N2+BF4, was successfully synthesized and used to react with BPQDs under aqueous conditions to give the first conjugated polymer covalently functionalized BPQDs (PFCz-g-BPQDs). The as-prepared Al/PFCz-g-BPQDs/ITO device exhibits excellent nonvolatile rewritable memory performance, with a large ON/OFF current ratio (>107) and low switch-on/off voltages (−0.89/+1.95 V). In contrast, the Al/PFCz-NH2 : BPQDs blend/ITO device also shows a rewritable memory effect, but its ON/OFF current ratio and Δ|VONVOFF| value are found to be 3 × 103 and 5.47 (Δ|+2.53–2.94|), respectively. This work, which offers an easy one-step strategy for direct covalent functionalization of BPQDs, opens a way to explore more applications of BPQDs.

Graphical abstract: Direct covalent modification of black phosphorus quantum dots with conjugated polymers for information storage

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Publication details

The article was received on 01 Dec 2018, accepted on 28 Jan 2019 and first published on 29 Jan 2019


Article type: Communication
DOI: 10.1039/C8NR09711A
Citation: Nanoscale, 2019,11, 3527-3533

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    Direct covalent modification of black phosphorus quantum dots with conjugated polymers for information storage

    Y. Cao, B. Zhang, X. Tian, M. Gu and Y. Chen, Nanoscale, 2019, 11, 3527
    DOI: 10.1039/C8NR09711A

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