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

Abstract

The present work reports a simple and single‐step hydrothermal synthesis of MoSe2−MoO3 composite for highly sensitive and selective electrochemical oxidation of nitrite. FESEM of the MoSe2−MoO3 hybrid revealed the formation of composite as laminated structure of different sizes piled up together as finger‐like MoSe2 bars whilst other physico‐chemical characterizations (XRD, FTIR, UV‐Vis, XPS) confirmed that co‐existence of MoO3 as a major by‐product of hydrothermal synthesis. The as‐fabricated MoSe2−MoO3 composite based nitrite sensor showed remarkable selectivity and reproducibility with <3s of response time, excellent sensitivity and detection limit of 10.84 A M−1 cm−2 (R2=0.996) and 0.1 μM, respectively, in the range of 2.5–80 μM. The obtained sensitivity can be credited to the high surface area obtained from 1T phase MoSe2 and α phase MoO3 as the sensing material. The developed sensor was effectively evaluated for electrochemical recognition of nitrite in the water samples (potable and tap water) gathered from an industrial area. This new and efficient MoSe2−MoO3 based electrode material offers a new frontier for the progress of a novel composites by simple and single‐step approach which can be used for progress of non‐enzymatic and inexpensive electrochemical sensors for a wide range of analytical applications.

High capacitive h‐MoO 3 hexagonal rods and its applications towards lithium ion battery, humidity and nitrite sensing

“…This composite has exhibited remarkable sensitivity and showed a limit of ion detection 0.1 μM. Second work is a composite, this heterojunction structure was the reason to get the lower detection value and without any dopants and composites, bare MoO 3 has displayed almost nearer sensing value 55 . The data on the detection of nitrite using h‐MoO 3 modified GCE is seldom found in the literature.…”

“…GCE has played an important role in facilitating the electron transfer activity in order to obtain better repeatability and sensitivity 45 . Nitrite sensing mechanism of h‐MoO 3 electrocatalyst could be deduced by 2 e − reaction process of h‐MoO 3 on GCE due to the conversion of to 54,55 and explained in Equation ) and Figure S3. …”

“…Second work is a composite, this heterojunction structure was the reason to get the lower detection value and without any dopants and composites, bare MoO 3 has displayed almost nearer sensing value. 55 The data on the detection of nitrite using h-MoO 3 modified GCE is seldom found in the literature. Based on the above discussion, in the present work, the authors have obtained the lower detection limit of 0.196 μM, this value is lower than first reported paper.…”

Hydrothermal Synthesis of Zr‐Amino Terephthalate and its Composite with MWCNTs as a Novel Electrode Material in Nitrite Quantification

“…Li et.al have reported PdFe ultrathin nanosheets in nitrite quantification [43]. Vishnu et.al have used MoSe 2 −MoO 3 composite as an electrode material in nitrite sensing [44]. Sejin Ahn et.al have reported an electrochemically deposited vertically aligned platinum (Pt) nanoplates fabricated on gold (Au) substrate as a nitrite sensing platform [45].…”

Synthesis of Gadolinium-Doped Molybdenum Diselenide Nanospheres for Ultrasensitive Electrochemical Determination of Essential Amino Acid in Human Serum and Milk Samples

“…20 Vishnu et al used the fabricated MoSe 2 -MoO 3 as a composite to detect nitrite with notable selectivity and good reproducibility. 21 In recent times, rare Earth metals have been used as a dopant for various applications owing to their magnetic nature, high conductivity, luminescent, and electrochemical properties which are based on electron transfer occurring within the 4 f energy levels. [22][23][24] Furthermore, for electrochemical sensing, rare Earth metals have been proved as a key factor to improve the sensing performance because of their excellent catalytic nature, high surface basicity, and fast oxygen ion mobility.…”