Enhanced field emission characteristics of a 3D hierarchical Hfo2-Zno heteroarchitecture

TitleEnhanced field emission characteristics of a 3D hierarchical Hfo2-Zno heteroarchitecture
Publication TypeJournal Article
Year of Publication2017
AuthorsShisode, RT, Suryawanshi, SR, Mistari, CD, Late, DJ, More, MA
JournalChemistrySelect
Volume2
Issue7
Pagination2305-2310
Date PublishedMAR
Type of ArticleArticle
ISSN2365-6549
Keywords3D heteroarchitecture, Field Emission (FE), hydrothermal, PLD, TEM
Abstract

Three dimensional (3D) HfO2-ZnO heteroarchitecture comprised of thin coating of HfO2 on self assembled 3D ZnO urchins with pointed apex has been synthesized using hydrothermal route followed by Pulsed Laser Deposition (PLD). The as-synthesized HfO2-ZnO heteroarchitecture was characterized using XRD, SEM, EDS, and (HR) TEM, in order to reveal its structural, morphological, and chemical properties. The HfO2-ZnO heteroarchitecture emitter exhibits superior field emission (FE) behaviour in contrast to the pristine ZnO urchins, demonstrated by delivery of high emission current density of similar to 885 mA/cm2 at an applied field of similar to 3.35 V/mm, against similar to 383 mA/cm(2) at an applied field of similar to 4.32 V/mu m for the pristine ZnO urchins emitter. Interestingly, the HfO2-ZnO heteroarchitecture emitter exhibits excellent emission current stability characterized with fewer fluctuations, owing to very good ion-bombardment resistance offered by the HfO2 coating. Furthermore, the heteroarchitecture thus obtained facilitates tailoring of the morphology with high aspect ratio and modulation of electronic properties as well, thereby enhancing the FE behaviour. Despite HfO2 being wide band gap and high-k material, the HfO2-ZnO heteroarchitecture exhibits potential as promising candidate for fabrication of high current density cold cathode

DOI10.1002/slct.201601723
Type of Journal (Indian or Foreign)Foreign
Impact Factor (IF)1.505
Divison category: 
Physical and Materials Chemistry

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