Study on Ni-doped ZnO films as gas sensors

Rambu, Alicia Petronela; Ursu, Laura; Iftimie, N.; Nica, Valentin; Dobromir, Marius; Iacomi, Felicia

doi:10.1016/j.apsusc.2013.05.033

Cited by 93 publications

(47 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…It seems that the introduction of Co(Ni) atoms in ZnO structure and increasing their concentration slightly reduces the average crystallite size. The same behavior was reported for ZnO:Ni [12] and ZnO:Al thin films [13]. The authors consider that some quantity of dopant atoms prefers to locate in or near the grain boundary regions, determining a decrease of crystallite size.…”

Section: Resultssupporting

confidence: 66%

Structural and optical properties of Co and Ni doped ZnO thin films prepared by RF magnetron sputtering

Stolyarchuk

Kleto

Dziedzic

2017

PCSS

View full text Add to dashboard Cite

We have reported the effect of Co and Ni doping on structural and optical properties of ZnO thin films prepared by RF reactive sputtering technique. The composite targets were formed by mixing and pressing of ZnO, Mn 3 O 4 , CoO and NiO powders. The thin films were deposited on sapphire, quartz and glass substrates. The structure study confirms the formation of the hexagonal wurtzite ZnO without any secondary phase in transition metal (Co, Ni) -doped samples. Cross-sectional TEM images of all studied samples show a denseand uniformly textured structure composed of column-like structure along the growth direction. The surface morphology of the thin films was studied using atomic force microscopy (AFM). Different surface morphology (AFM) images were obtained depending on the film composition and growth conditions. Optical absorption spectra suggest of substitution Zn 2+ ions in ZnO lattice by transition metal atoms. The shift of the absorption edge due to decrease the energy band gap with increasing cobalt content and complex dependence of the energy band gap on content of nickel was observed in optical absorption spectra of the studied films. The room temperature photoluminescence peaks are attributed to near band gap emission and vacancy or defect states.

show abstract

Section: Resultssupporting

confidence: 66%

Structural and optical properties of Co and Ni doped ZnO thin films prepared by RF magnetron sputtering

Stolyarchuk

Kleto

Dziedzic

2017

PCSS

View full text Add to dashboard Cite

show abstract

“…The Ni-doped ZnO was studied for its structural and electronic properties [25], magnetic properties and photoemission [26], and gas sensors [27]. The Mn-, Cu-and Co-doped (ZnO) 12 clusters were studied, and it was found that their band gaps decrease due to p-d hybridization orbitals of the dopant atom with the orbitals of the oxygen atom [28].…”

Section: Introductionmentioning

confidence: 99%

DFT investigation on molecular structures of metal and nonmetal-doped ZnO sodalite-like cage and their electronic properties

2015

View full text Add to dashboard Cite

The optimized structures of the ZnO sodalite-like cages (ZnOSLs) doped by single metal atoms (Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Pd, Ag, Pt and Au) and single nonmetal atoms (B, C, N, Al, Si, P, Ga and Ge) were obtained using DFT/B3LYP method. The energetics and thermodynamic properties for doping processes of single metal atom to Zn V of the Zn vacancy defect ZnOSL surface, (ZnOSL ? Zn V ) and nonmetal atom to O V of the O vacancy defect ZnOSL surface, (ZnOSL ? O V ) were obtained. The binding abilities of transition metal dopants to Zn V of [ZnOSL ? Zn V ] and nonmetal dopants to O V of [ZnOSL ? O V ] surfaces are in orders: Crrespectively. Energy gaps and NBO partial charges for low-spin and high-spin states of metal and nonmetal-doped ZnOSLs and their analyses are reported. Graphical Abstract Keywords Low-spin Á High-spin state Á ZnO sodalite-like cage Á Metal doping Á Nonmetal doping Á DFT Á NBO Electronic supplementary material The online version of this article (

show abstract

“…The thermal energy will increase by increasing the operating temperature to stimulate the oxidation of the tested gases (O 2 , H 2 and CO 2 ). On the other hands, the reducing gas (H 2 ) donates electrons to the investigated SGS films; therefore the resistance decreases (Rambu et al, 2013;Kashyout et al, 2010). When the operation temperature is increasing to higher value, the gas sensitivity is decreasing.…”

Section: 2mentioning

confidence: 97%

Synthesis, characterization and fabrication of gas sensor devices using ZnO and ZnO:In nanomaterials

Shokry

Kashyout

Morsi

et al. 2014

Beni-Suef University Journal of Basic and Applied Sciences

View full text Add to dashboard Cite

Available online xxxKeywords: ZnO nanorods Morphological structures Gas sensor devices Dopant elements solegel a b s t r a c t Undoped and In-doped ZnO including nanoparticles and nanorods were successfully synthesized via sol gel method. Effect of different doping ratios (1, 5 and 10%) of indium as a dopant element was optimized for the highest gas sensitivity. The morphological structures of prepared Undoped and doped ZnO were revealed using scanning electron microscope (SEM) and the aspect ratios of nanorods were calculated. X-ray diffraction (XRD) patterns reveal a highly crystallized wurtzite structure and used for identifying phase structure and chemical state of both ZnO and ZnO doped with In under different doping ratios. Energy dispersive X-ray (EDS) analysis was performed to be confirming the chemical composition of the In-doped ZnO nanopowders. The gas sensitivity for O 2 , CO 2and H 2 gases were measured for the fabricated gas sensor devices as a function of temperature for In-doped ZnO nanopowders and compared with un-doped ZnO films.

show abstract

Study on Ni-doped ZnO films as gas sensors

Cited by 93 publications

References 31 publications

Structural and optical properties of Co and Ni doped ZnO thin films prepared by RF magnetron sputtering

Structural and optical properties of Co and Ni doped ZnO thin films prepared by RF magnetron sputtering

DFT investigation on molecular structures of metal and nonmetal-doped ZnO sodalite-like cage and their electronic properties

Synthesis, characterization and fabrication of gas sensor devices using ZnO and ZnO:In nanomaterials

Contact Info

Product

Resources

About