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In this paper, we report a size-controlled metal oxide under a low-temperature process for the fabrication of an electrochemical sensor based on ultra-small nickel oxide (NiO) nanoparticles (NPs) which are utilized as electrode materials for the detection of n-butylamine chemical. The small size effect (∼6 ± 0.5 nm) and richness of Ni3+ ion concentration of as-synthesized ultra-small NiO nanoparticles exhibited high and reproducible sensitivity of ∼9.51 mA·mM−1·cm−2, limit of detection (LOD) ∼144.21 μM and correlation coefficient (R) ∼ 0.9688 with improved linearity in the range of 100 nM−100 μM.

Background: Family support can help older adults better adhere to exercise routine, but it remains unclear whether an exercise program targeting older married couples would have stronger effects on exercise adherence than would a program for individuals. The purpose of this study was to determine the effects of an exercise program on the exercise adherence of older married couples over a 24-week follow-up period.

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Well‐crystalline porous cobalt oxide (Co3O4) nanorods (NRs) were synthesized through hydrothermal method and applied as electro‐active electrode material for pseudo‐supercapacitors. At low calcination temperature of 300 °C, the porous and smooth morphology of Co3O4 NRs were obtained whereas, the rod morphology changed to stacks of nanoparticles at high calcination at 500 °C. The Fourier transform infrared (FTIR) and Raman scattering spectroscopies revealed the formation of pure and good crystal quality porous Co3O4 NRs. Brunauer‐Emmett‐Teller (BET) surface area analysis of porous Co3O4 NRs showed the decrease of surface area and pore volume with the increase of calcination temperature. The charge storage ability, cycle stability and ion transport of the synthesized porous Co3O4 NRs electrode were investigated by performing cyclic voltammetry (CV) in 6 M KOH electrolyte. As compared to Co3O4 NRs‐500 °C electrode, the specific capacitance of ∼226.3 Fg−1 at a scan rate of ∼10 mVs−1 was achieved by the fabricated pseudo‐supercapacitors based on porous Co3O4 NRs‐300 °C electrode. The synthesized porous Co3O4 NRs electrode showed excellent stability by maintaining up to ∼76% capacity retention after 5000 cycles.

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