Novel composite nanomaterials with superior thermal and pressure stability for potential LED applications

Kumar

2019

Ind. Eng. Chem. Res.

175

ZnO nanoparticles are still a hot area for research even after ample work has been done by researchers across the world. It is a versatile material for doping of different transition metals among other metal oxides. Having a large family of morphological structures, high electron mobility, and n-type carrier defects, it is suitable for a number of applications such as memory devices, spintronics, optoelectronic devices, solar cells, and sensors. Here, we have emphasized a review of the effects of transition metal (TM) doping on the different physical properties of ZnO nanoparticles and their applications. We have gone through some theoretical models which were used by most of the researchers for explaining the variations in physical properties. Explanation of the sensing, photocatalytic, and optoelectronic processes in different classes of devices is briefly described. Lastly, the comparative studies of different devices are also made available for clear understanding.

Section: Application Of Tm Znomentioning

confidence: 99%

Progress on Transition Metal-Doped ZnO Nanoparticles and Its Application

Kumar

2019

Ind. Eng. Chem. Res.

175

“…The Nd-doped ZnO exhibits dramatically sharp luminescence peaks, which is in sharp contrast with pure ZnO. Moreover, luminescent peaks are located at 897.6, 815.1, 674.2, and 604.0 nm ( 4 F 3/2 , 4 F 5/2 + 2 H 9/2 , 4 F 9/2 , and 4 G 7/2 + 2 G 5/2 ), corresponding to the UV–vis absorption spectra 20 . Figure 2d shows the Nd-ion doping concentration-dependent PL intensity of Zn 1 − x Nd x O, which initially increases with the enhancement of the Nd concentration.…”

Section: Introductionmentioning

confidence: 99%

“…S4). The SERS 20 . Figure 2d shows the Nd-ion doping concentration-dependent PL intensity of Zn 1 − x Nd x O, which initially increases with the enhancement of the Nd concentration.…”

Section: Introductionmentioning

confidence: 99%

Monitoring the charge-transfer process in a Nd-doped semiconductor based on photoluminescence and SERS technology

et al. 2020

Self Cite

Surface-enhanced Raman scattering (SERS) and photoluminescence (PL) are important photoexcitation spectroscopy techniques; however, understanding how to analyze and modulate the relationship between SERS and PL is rather important for enhancing SERS, having a great effect on practical applications. In this work, a charge-transfer (CT) mechanism is proposed to investigate the change and relationships between SERS and PL. Analyzing the change in PL and SERS before and after the adsorption of the probe molecules on Nd-doped ZnO indicates that the unique optical characteristics of Nd 3+ ions increase the SERS signal. On the other hand, the observed SERS can be used to explain the cause of PL background reduction. This study demonstrates that modulating the interaction between the probe molecules and the substrate can not only enhance Raman scattering but also reduce the SERS background. Our work also provides a guideline for the investigation of CT as well as a new method for exploring fluorescence quenching.

“…ZnO has been widely studied because of its enrichment, economical fabrication techniques, high photosensitivity, nontoxicity, and photochemical stability. 8,9 Moreover, ZnO has other distinctive properties such as biocompatibility, self-cleaning, and photocatalysis, providing multifunctional potential. 10,11 However, the wide band gap and the rapid recombination of photoexcited electron−hole pairs of ZnO hinder the practical application of photoelectric conversion.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, it is crucial to develop high sensitivity and lower cost SERS semiconductor substrates. ZnO has been widely studied because of its enrichment, economical fabrication techniques, high photosensitivity, nontoxicity, and photochemical stability. , Moreover, ZnO has other distinctive properties such as biocompatibility, self-cleaning, and photocatalysis, providing multifunctional potential. , However, the wide band gap and the rapid recombination of photoexcited electron–hole pairs of ZnO hinder the practical application of photoelectric conversion. There are several ways to improve the photoelectric conversion efficiency of ZnO, such as doping, surface modification, crystal growth control, and heterostructure formation.…”

Section: Introductionmentioning

confidence: 99%

Improved Charge Transfer and Hot Spots by Doping and Modulating the Semiconductor Structure: A High Sensitivity and Renewability Surface-Enhanced Raman Spectroscopy Substrate

et al. 2019

Self Cite

Here, we develop a new method to improve the surface-enhanced Raman spectroscopy (SERS) activity of ZnO using Mg doping combined with noble metals. Highly aligned silver nanoparticles (AgNPs) decorated on an array of Mg-doped ZnO (MZO@Ag) were fabricated. Using rhodamine 6G as the probe molecule, SERS indicated that the MZO@Ag substrate possesses perfect sensitivity, homogeneity, and chemical stability. The enhancement mechanism of this substrate was analyzed in detail, and finite-difference time-domain (FDTD) simulations were used to examine “hot spot” distribution which generated gaps between the balls, the rods, and the stems. FDTD simulation calculated (E/E 0)4 to be 2.5 × 106. Furthermore, the prepared substrates could degrade the target molecules in situ irradiated by visible light irradiation over the course of 40 min and then efficiently recover detectability through a recycling process. Our substrates were easy to fabricate, self-cleaning, and reusable. They are expected to provide new opportunities for the use of SERS in biological sensors, biomedical diagnostics, and food safety.