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. 2024 Nov 13;7(1):310-319.
doi: 10.1039/d4na00539b. eCollection 2024 Dec 17.

Enhanced field emission performance of gold nanoparticle decorated Bi2S3 nanoflowers

Gorkshnath H Gote  1 , Madhura P Deshpande  2 , Somnath R Bhopale  3 , Mahendra A More  4 , Raphael Longuinhos Monteiro Lobato  5 , Jenaina Ribeiro-Soares  5 , Dattatray J Late  5
Affiliations

Enhanced field emission performance of gold nanoparticle decorated Bi2S3 nanoflowers

Gorkshnath H Gote et al. Nanoscale Adv. .

Abstract

Au nanoparticles (NPs) are decorated on hydrothermally synthesized Bi2S3 nanorods (NRs) to enhance the field electron emission (FEE) performance as compared to bare Bi2S3 nanorods, resulting in reduction in turn-on field from 3.7 to 2.7 V μm-1 (at the current density of 1.0 μA cm-2) with significant increment in maximum emission current density from 138 to 604.8 μA cm-2 (at a field of 7.8 V μm-1) respectively. FESEM/TEM reveals that Bi2S3 nanoflowers are assembled from Bi2S3 NRs of a typical diameter of 120 ± 10 nm, and Au NPs of diameter about 5-10 nm are uniformly decorated onto the surface of NRs to form an Au/Bi2S3 composite. XRD analysis suggests that the as-synthesized product consists of orthorhombic Bi2S3 NRs decorated with face-centered cubic Au NPs. The XPS spectrum shows the elemental mapping of the as-synthesized Au/Bi2S3. Improvement in field emission properties is mainly attributed to a reduction in work function and increasing emitting sites due to Au NP decoration.

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Conflict of interest statement

The authors declare no conflicts of interest.

Figures

Fig. 1
Fig. 1. Schematic depiction of the mechanism of (a) the hydrothermal synthesis of Bi2S3 microflowers, (b) Au decoration process on as-synthesized Bi2S3 NRs and schematic structure of Bi2S3.
Fig. 2
Fig. 2. XRD of the (a) Au/Bi2S3 sample and (b) Bi2S3; (c) and (d) are JCPDS cards of Au and Bi2S3 crystals, respectively.
Fig. 3
Fig. 3. FESEM images: (a) low magnification Bi2S3 microflowers, (b) high magnification Bi2S3 with the inset displaying nanorods; TEM images (c and d) of bare Bi2S3 and Au decorated Bi2S3 NRs, respectively.
Fig. 4
Fig. 4. TEM image of (a) Au/Bi2S3 NRs with the inset displaying the NPs; (b) HRTEM image of Au/Bi2S3; (c and d) SAED pattern of bare Bi2S3 NRs and Au/Bi2S3 NRs, respectively.
Fig. 5
Fig. 5. XPS images of (a) Bi2S3 and Au/Bi2S3 survey spectra; high resolution spectra of (b) Au0 state, (c) Bi3+ state, (d) S2− state of the Au/Bi2S3 sample.
Fig. 6
Fig. 6. Plot of field emission current density versus applied electric field (J–E) (a), Fowler–Northeim (F–N) plot (b) of Bi2S3 and Au/Bi2S3, respectively. (c) Field emission current stability plots at 10 μA.
See this image and copyright information in PMC

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