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2 article(s) from Kumar, Sandeep

Quantification of lead through rod-shaped silver-doped zinc oxide nanoparticles using an electrochemical approach

Ravinder Lamba,
Gaurav Bhanjana,
Neeraj Dilbaghi,
Vivek Gupta and
Sandeep Kumar

Beilstein J. Nanotechnol. 2025, 16, 422–434, doi:10.3762/bjnano.16.33

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Figure 1: (a) XRD of Ag@ZnO NRs and (b) M–H plot of Ag@ZnO NRs.

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Figure 2: (a) SEM images, (b) diameter distribution of nanorods, and (c) EDS of Ag@ZnO NRs.

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Figure 3: FTIR of Ag@ZnO NRs.

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Figure 4: (a) UV–vis spectrum and (b) bandgap of Ag@ZnO NRs.

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Figure 5: Zeta potential of Ag@ZnO NRs.

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Figure 6: Raman spectra of Ag@ZnO NRs.

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Figure 7: XPS of Ag@ZnO NRs: (a) full scan spectrum, (b) scan of Ag 3d, (c) scan of oxygen 1s, and (d) scan o...

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Figure 8: Electrochemical impedance spectroscopy (EIS) Nyquist plots of modified Ag@ZnO NRs/Au and bare Au el...

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Figure 9: Cyclic voltammetry sweep curves for a modified electrode (black curve) or a bare electrode (red cur...

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Figure 10: Schematic diagram of the proposed electrochemical detection of lead using a potentiostat and a galv...

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Figure 11: (a) The I–V response of the modified electrode at varying scan rates and (b) peak current magnitude...

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Figure 12: (a) I–V response of the modified electrode at varying concentrations of lead; and (b) peak current ...

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Figure 13: I–V response of the modified electrode at a varying concentration of lead in (a) canal water, (b) g...

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Full Research Paper

Published 26 Mar 2025

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On the mechanism of piezoresistance in nanocrystalline graphite

Sandeep Kumar,
Simone Dehm and
Ralph Krupke

Beilstein J. Nanotechnol. 2024, 15, 376–384, doi:10.3762/bjnano.15.34

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Figure 1: (a) Two-point bending fixture showing two instances of a substrate during measurement. (b) Patterne...

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Figure 2: (a) Sheet resistance vs strain curve for NCG shown for two subsequently measured cycles of bending....

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Figure 3: (a) Piezoresistance measurement setup enabling in situ Raman measurements under strain. (b) Raman s...

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Figure 4: Correlation between transport in NCG films and grain rotation and reorientation under strain. Black...

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Full Research Paper

Published 08 Apr 2024

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