MoS2 based ultra-low-cost, flexible, non-enzymatic and non-invasive electrochemical sensor for highly selective detection of Uric acid in human urine samples

FeS2 Grown Pencil Graphite as an In‐expensive and Non‐enzymatic Sensor for Sensitive Detection of Uric Acid in Non‐invasive Samples

“…From equation (1), the sensitivity of the sensor is found to be 26.2×10 −3 A M −1 or 370 μA mM − cm −2 . The detection limit (L D ) using 3×s/b formula (s=standard deviation of signal; b=sensitivity achieved from the calibration plot) is 6.7 μM . The sensitivity of the pyrite FeS 2 ‐PGE is greater than previous reports as shown in Table which can be attributed to the following reasons: (1) excellent conductivity of the pyrite FeS 2 , (2) the mesoporous microspherical structure of the as‐grown pyrite FeS 2 on PGE provides larger surface area than only PGE which is obvious from Figure (A) and (3) abundance in defect sites originating from both the pyrite FeS 2 and functional groups of pencil graphite improves the electron transport during UA oxidation.…”

“…After dilution factor correction, the obtained value 143 μM is equivalent to the 1.43 mM UA content in the undiluted urine sample of the individual. Furthermore, to authenticate our developed sensor, a colorimetric technique was used to quantify the amout of UA in the same urine sample. From the colorimetric analyses (Table ), 1.61 mM of UA was detected in the urine sample and this results map well with our developed technique, establishing viability of this pyrite FeS 2 ‐PGE sensor for real‐time applications.…”

“…Uric acid (UA), an important biomarker is usually produced during purine metabolism in human bodies. Excess or insufficient supply of UA in urine and blood causes numerous diseases like gout, obesity, hypertension, fatty liver, arthritis, renal disorder, kidney stones and diabetes . Therefore, routine monitoring of UA levels is of great interest for disease diagnosis and treatment.…”

Single Step Synthesis of MoSe2−MoO3 Heterostructure for Highly Sensitive Amperometric Detection of Nitrite in Water Samples of Industrial Areas

“…In Figure C two (228.53 and 231.9 eV) couples of Mo 3d peaks at binding energies of 228.2 eV and 229.4 eV were noticed and assigned to Mo 3d 5/2 peaks of MoSe 2 and MoO 3 respectively. Likewise peaks at 231.5 eV and 232.5 eV correspond to the Mo 3d 3/2 of MoSe 2 and MoO 3 respectively . Figure D displayed one couple of peaks at 54.4 eV which corresponds to Se 3d orbital, indicating the existence of Se 2− in the as synthesized material , and the O 1s spectrum (Figure S2) displayed one couple of peak around 530 eV indicating the availability of oxides in the composite .…”

“…The higher mechanical strength is attributed to the strong covalent bond and the weak Vander wall interactions also offers the bulk material exfoliation to produce the few or single layers of 2D MoX 2 . Such single or few layered 2D MoS 2 and MoSe 2 have been extended for the various electrochemical applications . Comparatively, MoSe 2 exhibits the higher electro catalytic activity and electrical conductivity than MoS 2 because of the superior metallic property with electrocatalytic active unsaturated edge of Se Thus, MoSe 2 is extended for catalysis, optoelectronics and supercapacitor application .…”