Electrical conduction processes in neodymium oxide thin films prepared on Si(1 0 0) substrates

Dakhel, A.A.

doi:10.1016/j.jallcom.2004.01.009

Cited by 20 publications

(7 citation statements)

References 25 publications

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“…The rare-earth lanthanide Neodymium oxide (Nd 2 O 3 ) can act as either Lewis acid or Lewis base . The hygroscopic nature of Nd 2 O 3 leads to the formation of neodymium hydroxide (Nd(OH) 3 ) on its surface, and the hydroxyl groups or water molecules present on the Nd 2 O 3 form a weak hydrogen bond and are expected to act as ion-exchange sites or carriers of proton to contribute toward proton conductivity. It is also proven that by incorporating neodymium oxide, a hygroscopic rare-earth oxide and a dopant for H + ion conduction into the Nafion structure .…”

Section: Introductionmentioning

confidence: 99%

Ultrahigh Ion-Selective and Durable Nafion-NdZr Composite Layer Membranes for All-Vanadium Redox Flow Batteries

Hossain

Aziz

Shanmugam

2020

ACS Sustainable Chem. Eng.

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A thin Nafion-neodymium zirconium oxide nanotube (NdZr) composite (Nafion-NdZr) membrane has been fabricated and further modified by the polycation, poly(diallyldimethylammonium chloride) (PDDA), and polyanion, poly(sodium styrene sulfonate) (PSS). The ion selectivity of the Nafion-NdZr (1%)/[P-S]2 composite layer membrane was found to be 6.9, 3.5, and 2.3 times higher than those of recast Nafion, Nafion/[P-S]2 layer, and Nafion-NdZr (1%) composite membranes, respectively. As a result, the vanadium redox flow batteries (VFBs) assembled with Nafion-NdZr (1%) composite and Nafion-NdZr (1%)/[P-S]2 composite layer membranes have surpassed the VFB performance operated with recast Nafion and Nafion/[P-S]2 layer membranes. Noticeably, VFB operated with the Nafion-NdZr (1%)/[P-S]2 composite layer membrane (513.7 h) exhibited a longer self-discharge time than those with Nafion-NdZr (1%) (293.2 h), Nafion/[P-S]2 (124.1 h), and recast Nafion (32.7 h) membranes. Finally, the single VFB cell constructed with Nafion-NdZr (1%)/[P-S]2 and Nafion-NdZr (1%) membranes remarkably showed 80.1 and 73.4% capacity retention, respectively, over 200 charge–discharge cycles, whereas recast Nafion exhibited a 41.5% capacity retention over 100 cycles at a 40 mA cm–2 current density. The structure and morphology of the Nd2Zr2O7 nanotube, Nafion-NdZr composite, and Nafion-NdZr (1%)/[P-S]2 composite layer membranes were investigated by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, Fourier transform infrared, and atomic force microscopy analyses. Longer cyclic performance and excellent oxidative, chemical, and thermal stability further prove the durability of proposed membranes.

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Section: Introductionmentioning

confidence: 99%

Ultrahigh Ion-Selective and Durable Nafion-NdZr Composite Layer Membranes for All-Vanadium Redox Flow Batteries

Hossain

Aziz

Shanmugam

2020

ACS Sustainable Chem. Eng.

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“…Generally, the junctions between p-Si and metals with high work functions such as gold or aluminium are expected to form an ohmic contact. Therefore, so far many attempts have been made to realize the formation of a rectifying contact or modification of the barrier height or the continuous control of the barrier height using an organic semiconductor layer [5][6][7][8][9][10][11][12] or an insulating layer and a chemical passivation procedure [21][22][23][24][25][26][27][28][29] at certain metal/inorganic semiconductor interfaces, or to determine the characteristic parameters of organic films [5][6][7][8][9][10][11][12]. In the passivation process case, inorganic/organic semiconductor diodes may be sensitive probes that are useful for increasing the quality of devices fabricated using an organic semiconductor in establishing processes for minimizing surface states, surface damage and contamination.…”

Section: Introductionmentioning

confidence: 99%

“…Some researchers [14][15][16][17][18] have studied the electronic properties of the polymer/PPy [14,15] and PPy/inorganic semiconductor [16][17][18] heterostructures from their I -V , C-V and conductivity-temperature characteristics. Some activities have been also focused on understanding and controlling key parameters such as the interface potential barriers [16][17][18][19][20][21][22][23][24][25][26][27]. Thicker organic interlayers of the conjugated molecules have also been successfully used to modify effective barriers [16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

The temperature dependence of current–voltage characteristics of the Au/Polypyrrole/p-Si/Al heterojunctions

Aydoğan¹,

Sağlam²,

Türüt³

2006

J. Phys.: Condens. Matter

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The current–voltage (I–V) characteristics of Au/Polypyrrole/p-Si/Al contacts have been measured at temperatures ranging from 70 to 280 K. The I–V characteristics of the device have rectifying behaviour with a potential formed at the interface. The high values of the ideality factor n depending on the sample temperature may be ascribed to a decrease of the exponentially increasing rate in current due to space-charge injection into the PPy thin film at higher forward bias voltage. The experimental reverse bias I–V characteristics of the device followed the Schottky-like conduction model or Poole–Frenkel effect formulae. A linear temperature dependence of the barrier height Φb from the reverse bias I–V characteristics was observed, and the Φbo value decreased with lowering temperature, ranging from 0.69 eV at 280 K to 0.22 eV at 70 K.

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“…In this study, the glassy phase of sintered body is expected to be the mixture of SiO 2 and additive. Although the real refractive index of glassy phase cannot be calculated, it is possible to estimate the change in refractive index by addition of additive to SiO 2 from the refractive indices of additives: Y 2 O 3 (1.92), CaO (1.83), YAG (1.82), SrO (1.81), AlN (1.96), Sm 2 O 3 ,(1.93) Sc 2 O 3 (1.90), HfO 2 (1.92), La 2 O 3 (1.90), CeO 2 (1.94), Nd 2 O 3 (1.89), Al 2 O 3 (1.75),, and MgO (1.72), and the densities of the additives. The refractive indices and densities of binary additives were calculated on the basis of 3/1 ratio.…”

Section: Resultsmentioning

confidence: 99%

Influence of Sintering Aid on the Translucency of Spark Plasma‐Sintered Silicon Nitride Ceramics

et al. 2013

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Single additives (Y 2 O 3 , MgO, and Al 2 O 3 ) were used as sintering aid of Si 3 N 4 . The density, crystal phase, microstructure, transmittance, hardness, and fracture toughness of sintered Si 3 N 4 were investigated. Highly densified sintered bodies were obtained in single Y 2 O 3 and MgO systems, but not in single Al 2 O 3 system. The XRD results indicated that sintered bodies were composed of b-Si 3 N 4 . The SEM images showed that all the sintered bodies had a fine-grained microstructure with an average diameter of 0.29-0.37 lm. The thickness of grain boundary was changed with additive content. The transmittance (T) and the wavelength (k) followed the relationship of T∝ exp (Àk À2.3 ) due to the light scattering. The transmittance was mainly influenced by the refractive index of additives and the thickness of grain boundary phase. The hardness and fracture toughness of sintered ceramics were 12.6-15.5 GPa and 6.2-7.2 MPam

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Electrical conduction processes in neodymium oxide thin films prepared on Si(1 0 0) substrates

Cited by 20 publications

References 25 publications

Ultrahigh Ion-Selective and Durable Nafion-NdZr Composite Layer Membranes for All-Vanadium Redox Flow Batteries

Ultrahigh Ion-Selective and Durable Nafion-NdZr Composite Layer Membranes for All-Vanadium Redox Flow Batteries

The temperature dependence of current–voltage characteristics of the Au/Polypyrrole/p-Si/Al heterojunctions

Influence of Sintering Aid on the Translucency of Spark Plasma‐Sintered Silicon Nitride Ceramics

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