02204nas a2200253   4500008004100000022001400041245009300055210006900148260000800217300001400225490000600239520137800245653002601623653002401649653001701673653000801690653000801698100002201706700002801728700002401756700002401780700002301804856012301827       2017                        eng d  a2365-654900aEnhanced field emission characteristics of a 3D hierarchical Hfo2-Zno heteroarchitecture0 aEnhanced field emission characteristics of a 3D hierarchical Hfo  cMAR  a2305-23100 v23 a<p>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</p>10a3D heteroarchitecture10aField Emission (FE)10ahydrothermal10aPLD10aTEM1 aShisode, Raju, T.1 aSuryawanshi, Sachin, R.1 aMistari, Chetan, D.1 aLate, Dattatray, J.1 aMore, Mahendra, A.  uhttps://library.ncl.res.in/content/enhanced-field-emission-characteristics-3d-hierarchical-hfo2-zno-heteroarchitecture