MEMS-compatible, gold nanoisland anchored 1D aligned ZnO heterojunction nanofibers: unveiling the NO₂ sensing mechanism with operando photoluminescence studies

Abstract

Production and alignment of heterojunction metal oxide semiconductor nanomaterials-based sensing elements for microsensor devices has always posed fabrication challenges since it involves multi-step synthesis processes. Herein, we demonstrate a coaxial...

1D aligned, n–p and n–n type ZnO heterojunction nanofibers for NO2 sensors: exploration of conduction mechanism using in situ impedance spectroscopy

“…The heterostructured NFs were aligned transversely on the IDA fingers following the field of electric lines as evidenced by simulations as reported in our previous work. 40 During thermal oxidation, polymeric template was decomposed with formation of p-type Bi 2 O 3 and n-type In 2 O 3 nanoislands anchored on wurtzite ZnO nanofibers forming n–p and n–n type heterojunction interfaces, respectively, which were obtained as porous nanofibers. Fig.…”

“…Evaluation of NO 2 sensing properties of these sensor devices was performed using an in-house gas sensor test station existing in our laboratory. 40 Operating temperature of the HNFs has a vital role in enhancement in sensitivity and reliability of the sensor. The sensor response ( S = [ R g − R a ]/ R a ) was monitored while purging of 1 ppm NO 2 gas with varying temperatures between 50 and 350 °C for pristine ZnO, n-ZnO/p-Bi 2 O 3 and n-ZnO/n-In 2 O 3 HNFs to determine the suitable operating temperature as shown in the insets of Fig.…”

Rational Design of Advanced Triboelectric Materials for Energy Harvesting and Emerging Applications

“…Other researchers have treated random nanofibers by cold pressing, [ 62 ] hydrothermal method, [ 109 ] and gas‐phase polymerization [ 110 ] to develop the specific capabilities of TENGs. Hence, other advanced post‐treatments (e.g., gas–solid reaction, [ 111 ] in situ photoreduction, [ 112 ] sol–gel method [ 113 ] ) are expected to be employed for electrospun nanofibers for triboelectric materials in the near future.…”

Coaxial mechano‐electrospinning of oriented fibers with core‐shell structure for tactile sensing

“…To overcome this limitation, several methods regarding improved coaxial electrospinning were proposed mainly by using different collectors which can provide additional forces to control the direction of the jet 39 . A collector with two parallel electrodes connected to ground and a power, respectively, to drive charged fibers moving from one electrode to the other in order to achieve directional alignment of the core‐shell fibers has become a widely used method 40–43 . G. Nair et al 44 demonstrated a single‐step fabrication strategy based on coaxial electrospinning with two parallel electrodes which can change the drawing force by electric field as the collector aimed at collecting aligned CF@AuNPs‐PtNPs/NiNPs–PtNPs nanofibers.…”