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<p>The development of efficient and flexible piezoelectric nanogenerators (PENG) is critical for next-generation energy-harvesting devices. This study reports the direct growth of MoS<sub>2</sub> flakes on flexible carbon cloth (CC) using a water-based Na<sub>2</sub>MoO<sub>4</sub> precursor via chemical vapor deposition. The growth of MoS<sub>2</sub> flakes on CC was confirmed by Raman spectroscopy measurements. The frequency difference between the A<sub>1g</sub> and E<sup>1</sup><sub>2g</sub> modes ranged from 19.9 to 25.1&#xa0;cm<sup>−1</sup>, which indicates variation in MoS<sub>2</sub> thickness from a monolayer to a few layers. Photoluminescence (PL) emission from monolayer MoS<sub>2</sub> flakes was observed with a PL peak energy of ~ 1.88&#xa0;eV. The full width at half maximum of the PL peak was 60&#xa0;meV, narrower than obtained for MoS<sub>2</sub> on the SiO<sub>2</sub>/Si reference. It was found that micro-gaps on the surface of carbon threads may act as nucleation sites for MoS<sub>2</sub> growth, leading to the formation of MoS<sub>2</sub> flakes that protrude from the micro-gaps. In addition, droplets with diameters ranging from 40 to 120&#xa0;nm were observed. These may be attributed to the formation of Na<sub>2</sub>MoO<sub>4</sub> nano-droplets due to the hydrophobic properties of the CC, which then underwent a sulfurization process. Finally, a proof-of-concept PENG was fabricated using the MoS<sub>2</sub>/CC and copper electrodes. The device showed a high peak-to-peak voltage of 24&#xa0;V. This work highlights the potential of water-based precursors for the scalable growth of high-quality MoS<sub>2</sub> on flexible substrates for high-performance energy harvesting and wearable electronics. </p>

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Chemical vapor deposition of MoS2 on flexible carbon cloth using Na2MoO4 liquid precursor for piezoelectric nanogenerators

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年6月27日

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  • Muhammad Hilmi Johari,
  • Shazreen Sulaiman,
  • Siti Nur Hidayah Yahya,
  • Mohd Ambri Mohamed,
  • Abdul Rahman Mohmad

摘要

The development of efficient and flexible piezoelectric nanogenerators (PENG) is critical for next-generation energy-harvesting devices. This study reports the direct growth of MoS2 flakes on flexible carbon cloth (CC) using a water-based Na2MoO4 precursor via chemical vapor deposition. The growth of MoS2 flakes on CC was confirmed by Raman spectroscopy measurements. The frequency difference between the A1g and E12g modes ranged from 19.9 to 25.1 cm−1, which indicates variation in MoS2 thickness from a monolayer to a few layers. Photoluminescence (PL) emission from monolayer MoS2 flakes was observed with a PL peak energy of ~ 1.88 eV. The full width at half maximum of the PL peak was 60 meV, narrower than obtained for MoS2 on the SiO2/Si reference. It was found that micro-gaps on the surface of carbon threads may act as nucleation sites for MoS2 growth, leading to the formation of MoS2 flakes that protrude from the micro-gaps. In addition, droplets with diameters ranging from 40 to 120 nm were observed. These may be attributed to the formation of Na2MoO4 nano-droplets due to the hydrophobic properties of the CC, which then underwent a sulfurization process. Finally, a proof-of-concept PENG was fabricated using the MoS2/CC and copper electrodes. The device showed a high peak-to-peak voltage of 24 V. This work highlights the potential of water-based precursors for the scalable growth of high-quality MoS2 on flexible substrates for high-performance energy harvesting and wearable electronics.