Nanostructured semiconducting metal oxides and particularly single nanowire devices offer exceptional gas sensitivity but at the expense of statistical variations excessive noise levels. In this study TiO2/poly(vinyl acetate) composite nanofiber mats were directly electrospun onto interdigitated Pt electrode arrays, hot pressed 120 degrees C, calcined 450 C. This resulted in a novel multiple network composed sheaths 200-500 nm diameter cores filled with readily accessible approximately 10...

We report on the heterogeneous sensitization of metal-organic framework (MOF)-driven metal-embedded metal oxide (M@MO) complex catalysts onto semiconductor (SMO) nanofibers (NFs) via electrospinning for markedly enhanced chemical gas sensing. ZIF-8-derived Pd-loaded ZnO nanocubes (Pd@ZnO) were sensitized both interior and exterior WO3 NFs, resulting in formation multiheterojunction Pd-ZnO ZnO-WO3 interfaces. The Pd@ZnO loaded NFs found to exhibit unparalleled toluene sensitivity (Rair/Rgas =...

Abstract This work presents a new route to suppress grain growth and tune the sensitivity selectivity of nanocrystalline SnO 2 fibers. Unloaded Pd‐loaded nanofiber mats are synthesized by electrospinning followed hot‐pressing at 80 °C calcination 450 or 600 °C. The chemical composition microstructure evolution as function Pd‐loading temperature examined using EDS, XPS, XRD, SEM, HRTEM. Highly porous fibrillar morphology with fibers comprising crystallites decorated tiny PdO is observed. size...

Flexible and stretchable electrochromic supercapacitor systems are widely considered as promising multifunctional energy storage devices that eliminate the need for an external power source. Nevertheless, performance of conventional designs deteriorates significantly a result electrode/electrolyte exposure to atmosphere well mechanical deformations case flexible systems. In this study, we suggest all-transparent device with ultrastable performance, which consists Au/Ag core-shell...

Sensitive detection of acetone and hydrogen sulfide levels in exhaled human breath, serving as breath markers for some diseases such diabetes halitosis, may offer useful information early diagnosis these diseases. Exhaled analyzers using semiconductor metal oxide (SMO) gas sensors have attracted much attention because they low cost fabrication, miniaturization, integration into portable devices noninvasive medical diagnosis. However, SMO often display cross sensitivity to interfering...

Designing a highly efficient catalyst is essential to improve the electrochemical performance of Li–O2 batteries for long-term cycling. Furthermore, these often show significant capacity fading due irreversible reaction characteristics Li2O2 product. To overcome limitations, we propose bifunctional composite composed electrospun one-dimensional (1D) Co3O4 nanofibers (NFs) immobilized on both sides 2D nonoxidized graphene nanoflakes (GNFs) an oxygen electrode in batteries. Highly conductive...

Thin-walled WO3 hemitubes and catalytic Pt-functionalized were synthesized via a polymeric fiber-templating route used as exhaled breath sensing layers for potential diagnosis of halitosis diabetes through the detection H2S CH3COCH3, respectively. with wall thickness 60 nm exhibited superior acetone sensitivity (Rair/Rgas = 4.11 at 2 ppm) negligible response, pristine showed 4.90-fold toward minimal acetone-sensing characteristics. The limit (Rair/Rgas) fabricated sensors was 1.31 120 ppb,...

The increase of surface area and the functionalization catalyst are crucial to development high-performance semiconductor metal oxide (SMO) based chemiresistive gas sensors. Herein, nanoscale loaded Co3O4 hollow nanocages (HNCs) by using metal-organic framework (MOF) templates have been developed as a new sensing platform. Nanoscale Pd nanoparticles (NPs) were easily on cavity Co zeolite imidazole (ZIF-67). porous structure ZIF-67 can restrict size NPs (2-3 nm) separate from each other....

The effect of Ag decoration on the gas sensing characteristics SnO2 nanowire (NW) networks was investigated. layers with thicknesses 5–50 nm were uniformly coated surface NWs via e-beam evaporation, which converted into isolated or continuous configurations islands by heat treatment at 450 °C for 2 h. decorated nano-islands displayed a 3.7-fold enhancement in response to 100 ppm C2H5OH compared pristine NWs. In contrast, as became continuous, decreased significantly. and deterioration...

To achieve a high reversibility and long cycle life for lithium-oxygen (Li-O2) batteries, the irreversible formation of Li2O2, inevitable side reactions, poor charge transport at cathode interfaces should be overcome. Here, we report rational design air using cobalt nitride (Co4N) functionalized carbon nanofiber (CNF) membrane as current collector-catalyst integrated cathode. Brush-like Co4N nanorods are uniformly anchored on conductive electrospun CNF papers via hydrothermal growth Co(OH)F...

As a futuristic diagnosis platform, breath analysis is gaining much attention because it noninvasive, simple, and low cost diagnostic method. Very promising clinical applications have been demonstrated for purposes by correlation between exhaled components specific diseases. In addition, diverse molecules, which serve as biomarkers diseases, are precisely identified statistical pattern recognition studies. To further improve the accuracy of tool, sampling, biomarker sensing, data should be...

Highly selective detection, rapid response (<20 s), and superior sensitivity (Rair/Rgas> 50) against specific target gases, particularly at the 1 ppm level, still remain considerable challenges in gas sensor applications. We propose a rational design facile synthesis concept for achieving exceptionally sensitive detection of trace biomarkers exhaled human breath using protein nanocage templating route sensitizing electrospun nanofibers (NFs). The mesoporous WO3 NFs, functionalized with...

Hydrogen (H2) is one of the next-generation energy sources because it abundant in nature and has a high combustion efficiency that produces environmentally benign products (H2O). However, H2/air mixtures are explosive at H2 concentrations above 4%, thus any leakage must be rapidly reliably detected much lower to ensure safety. Among various types sensors, chemiresistive sensors most promising sensing systems due their simplicity low cost. This review highlights advances chemiresistors,...

The oxygen, O2, in air interferes with the detection of H2 by palladium (Pd)-based sensors, including Pd nanowires (NWs), depressing sensitivity and retarding response/recovery speed air—relative to N2 or Ar. Here, we describe preparation sensors which a nanofiltration layer consisting Zn metal–organic framework (MOF) is assembled onto NWs. Polyhedron particles Zn-based zeolite imidazole (ZIF-8) were synthesized on lithographically patterned NWs, leading creation ZIF-8/Pd NW bilayered...

A novel, facile synthetic route has been proposed to prepare a 3D nanoarchitecture of Ge coated with carbon (3D-Ge/C) <italic>via</italic> carbothermal reduction.

Rational design and massive production of bifunctional catalysts with fast oxygen reduction reaction (ORR) evolution (OER) kinetics are critical to the realization highly efficient lithium–oxygen (Li–O2) batteries. Here, we first exploit two types double-walled RuO2 Mn2O3 composite fibers, i.e., (i) phase separated RuO2/Mn2O3 fiber-in-tube (RM-FIT) (ii) multicomposite tube-in-tube (RM-TIT), by controlling ramping rate during electrospinning process. Both RM-FIT RM-TIT exhibited excellent...