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Abstract
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A simple,low-cost,andgreenprocesswasusedforthesynthesisofcarbonquantumdots(CQDs)through
the hydrothermaltreatmentofsalepasanovelbio-polymericcarbonsourceinpresenceofonlypure
water.Thesilvernanoparticles(AgNPs)wereembeddedonthesurfaceofCQDsbyultra-violate(UV)
irradiation totheCQDsandsilvernitratemixturesolution.Theas-synthesizedCQDsandAgNPsdeco-
ratedCQDsnanohybrid(AgNPs/CQDs)werecharacterizedbyUV–vis andphotoluminescencespectro-
scopy,Fouriertransform-infraredspectroscopy,transmissionelectronmicroscopy,atomicforcemicro-
copy,X-raydiffraction,and field emissionscanningelectronmicroscopy.Then,theAgNPs/CQDsnano-
hybridwascastedontheglassycarbonelectrodeinordertoprepareanamperometrichydrogenper-
oxide(H2O2) sensor.TheelectrochemicalinvestigationsshowthattheAgNPs/CQDsnanohybridpos-
sesses anexcellentperformancetowardtheH2O2 reduction. Intheoptimumcondition,thelinearrange
of H2O2 determination wasachievedfrom0.2to27.0 μM withhighsensitivity(1.5 μA/mM) andthelimit
of detectionwasobtainedabout80nM(S/N¼3). Finally,thepreparednanohybridmodified electrode
waseffectivelyappliedtotheH2O2 detection inthedisinfectedfetalbovineserumsamples,andthe
recoverywasobtainedabout98%.TheachievedresultsindicatethattheAgNPs/CQDsnanohybridwith
high reproducibility,repeatability,andstabilityhasafavorablecapabilityinelectrochemicalsensors
improvement.
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