Enhanced ultra-stable n-propylamine sensing behavior of V₂O₅/In₂O₃ core–shell nanorods

Abstract

Heterostructured V 2 O 5 /In 2 O 3 core-shell nanorods were prepared by the combination of solid solution and hydrothermal methods. Microstructural and spectroscopic studies reveal the effective core-shell hetero-nanostructure. The gas sensor based on these nanorods exhibits remarkable gas sensing properties in both static and dynamic modes. It presents optimum working temperature of 190 o C, a reasonable response speed and high selectivity with an ultra-stable reproducible response towards n-propylamine. The sensor also shows enhanced optimum sensitivity (~14), which is 3.90 times as compared to the pure V 2 O 5 nanorods. Such promising gas sensing behavior of the hetero-nanostructured core-shell nanorods has been explained on the basis of energy band model and a suitable gas sensing mechanism has been established as well.

Highly efficient overall water splitting performance of gadolinium‐indium‐zinc ternary oxide nanostructured electrocatalyst

“…The associated satellite peaks additionally approve the existence of Gd 2 O 3 phase in GIZO. The indium (In 3d) core level XPS spectrum shown in Figure 3C affirms the trivalent nature of In ions in GIZO via In3d 5/2 at 453.2 eV and In3d 3/2 at 445.5 eV, correspondingly 18 . Similarly, the 2 + state of Zn ions is visually represented through Figure 3D with Zn 2p 3/2 signal at 1022.53 and Zn 2p 1/2 signal at 1045.91 eV, respectively.…”

“…The intermediate binding of O ions and the metallic elements in GIZO was studied using the O 1s core level XPS spectrum provided in Figure 3E. The deconvoluted spectrum reveals four distinct peaks at 529.5, 530.9, 532.2 and 533.5 eV, ascribing the M‐O, M‐OH, C=O and surface water molecule related bonding in ternary oxides 18‐21 . Furthermore, the atomic percentage of Gd, In, Zn and O ions was estimated to be around 42%, 18%, 12% and 28%, respectively.…”

SmFeO 3 and SmFe 1‐x Er x O 3 based perovskite nanorods for improved oxygen and hydrogen evolution functions

“…O 1s core level spectrum shown in Figure 5D was next studied to analyze the nature of oxygen binding with rare earth metallic ions. The deconvoluted O peaks were further identified to describe the FeO, SmO, OH and surface adsorbed H 2 O in SFEO 34‐37 . Adsorption actually results from the vacancies and interstitials generated by substitution of Er ions in SFEO perovskites.…”

“…The deconvoluted O peaks were further identified to describe the Fe O, Sm O, OH and surface adsorbed H 2 O in SFEO. [34][35][36][37] Adsorption actually results from the vacancies and interstitials generated by substitution of Er ions in SFEO perovskites.…”

A Review of Nanostructured Resistive-Based Vanadium Oxide Gas Sensors

“…Additionally, presence of the two types of materials with different reduction-oxidation and acid-base properties affected the selectivity of the gas sensor to n-propylamine [92].…”