Wet-Chemical Synthesis of ZnO Nanowires on 
Low-Temperature Photo-Activated ZnO-rGO Composite 
Thin Film with Enhanced Photoconduction

Chakraborty, Abhisek; Pizzoferrato, R.; Agresti, Antonio; F, De Matteis; Orsini, Andrea; Medaglia, P. G.

doi:10.1007/s11664-018-6473-5

Cited by 11 publications

(7 citation statements)

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“…and B an inorganic one, the perovskite is considered as hybrid organic-inorganic. On the contrary, if A is inorganic (mostly Cs + ) the perovskite is all-inorganic.Hybrid organic-inorganic metal halides (HOIMHs) have been extensively investigated for a wide range of applications, such as photovoltaics [2][3][4][5][6][7], light emitting diodes (LED) or lasers [8][9][10][11][12][13], radiation detection [14], and down-converting phosphors [15][16][17]. Interesting carrier transport properties have been observed in Pb-and Sn-based 3D halide perovskites [18,19].…”

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confidence: 99%

Optical Characterization of Cesium Lead Bromide Perovskites

Vitale

Privitera

et al. 2019

Crystals

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CsPbBr 3 and Cs 4 PbBr 6 perovskite powders have been synthesized through a relatively simple low-temperature and low-cost method. Nanocrystalline films have also been deposited from solutions with four different molar compositions of binary salt precursors. Optical absorption, emission and excitation spectra have been performed in the UV-visible spectral range while X-ray diffraction (XRD) has been recorded to characterize the nanocrystal morphology for the different molar compositions. A preferential orientation of crystallites along the (024) crystalline plane has been observed as a function of the different deposition conditions in films growth. All the crystals show an absorption edge around 530 nm; Tauc plots of the absorption returned bandgaps ranging from 2.29 to 2.35 eV characteristic of CsPbBr 3 phase. We attribute the UV absorption band peaked at 324 nm to the fundamental band-to-band transition for Cs 4 PbBr 6 . It was observed that the samples with the most ordered Cs 4 PbBr 6 crystals exhibited the most intense emission of light, with a bright green emission at 520 nm, which are however due to the luminescence of the inclusion of CsPbBr 3 nanoclusters into the Cs 4 PbBr 6 . The latter shows instead an intense UV emission. Differently, the pure CsPbBr 3 powder did not show any intense fluorescent emission. The excitation spectra of the green fluorescent emission in all samples closely resemble the CsPbBr 3 absorption with the peculiar dip around 324 nm as expected from density of state calculations reported in the literature. and B an inorganic one, the perovskite is considered as hybrid organic-inorganic. On the contrary, if A is inorganic (mostly Cs + ) the perovskite is all-inorganic.Hybrid organic-inorganic metal halides (HOIMHs) have been extensively investigated for a wide range of applications, such as photovoltaics [2][3][4][5][6][7], light emitting diodes (LED) or lasers [8][9][10][11][12][13], radiation detection [14], and down-converting phosphors [15][16][17]. Interesting carrier transport properties have been observed in Pb-and Sn-based 3D halide perovskites [18,19]. HOIMHs, like MAPbI 3 , have been broadly studied as solar absorber materials in photovoltaic cells [20].Distinct crystalline forms with the general formula A n BX 2+n give rise to an extended perovskite family [21]. They differ in the spatial coordination of the metal-halide octahedra XBr 6 4where the value of n determines the perovskite's structural dimensionality expressing the coordination of octahedra: n = 1 characterizes three-dimensional (3D) perovskites with corner-shared octahedra along every axis, n = 4 identifies zero-dimensional (0D) perovskites with isolated octahedra, as shown in Figure 1a for cesium lead perovskites. Efficient photoluminescence is associated to the intrinsic geometric structures or the different network dimensionalities due to the occurrence of quantum confinement into the isolated octahedra of 0D-crystals [22]. The Frenkel excitons result self-trapped in correspondence of the octahedron center...

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confidence: 99%

Optical Characterization of Cesium Lead Bromide Perovskites

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Privitera

et al. 2019

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“…The two main peaks of GO samples were D bands (1352 cm −1 ) and G bands (1590 cm −1 ), which were moved slightly to 1341 and 1591 cm −1 in the rGO sample. Note that the D band is attributed to flaws such as disordered sp 3 bonded carbons and edges, and the G band relates to in‐plane stretching of ordered sp 2 bonded carbons [26]. When compared with the rGO samples, the Raman spectra of ZnO@rGO nanomaterials exhibited both G (~1349 cm −1 ) and D bands (~1594 cm −1 ), indicating that the construction of rGO was retained in the ZnO@rGO nanomaterial.…”

Section: Resultsmentioning

confidence: 99%

Inhibition of α‐glucosidase activity by curcumin loaded on ZnO@rGO nanocarrier for potential treatment of diabetes mellitus

Liu,

Wang,

Yap

et al. 2024

Luminescence

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Curcumin (Cur) is an acidic polyphenol with some effects on α‐glucosidase (α‐Glu), but Cur has disadvantages such as being a weak target, lacking passing the blood–brain barrier and having low bioavailability. To enhance the curative effect of Cur, the hybrid composed of ZnO nanoparticles decorated on rGO was used to load Cur (ZnO@rGO‐Cur). The use of the multispectral method and enzyme inhibition kinetics analysis certify the inhibitory effect and interaction mechanism of ZnO@rGO‐Cur with α‐Glu. The static quenching of α‐Glu with both Cur and ZnO@rGO‐Cur is primarily driven by hydrogen bond and van der Waals interactions. The conformation‐changing ability by binding to the neighbouring phenolic hydroxyl group of Cur increased their ability to alter the secondary structure of α‐Glu, resulting in the inhibition of enzyme activity. The inhibition constant (Ki, Cur > Kis,ZnO@rGO‐Cur) showed that the inhibition effect of ZnO@rGO‐Cur on α‐Glu was larger than that of Cur. The CCK‐8 experiments proved that ZnO@rGO nanocomposites have good biocompatibility. These results suggest that the therapeutic potential of ZnO@rGO‐Cur composite is an emerging nanocarrier platform for drug delivery systems for the potential treatment of diabetes mellitus.

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“…The nanometer dimensions of the ZnO nanowires result in the accurate tuning of the resonant frequency, while the much larger (e.g., few millimeters) diameter of the quartz allows straightforward interfacing, simple handling, and packaging. Interestingly, ZnO is also widely employed for surface acoustic wave devices, so that our approach could be easily extended to this important class of electromechanical resonators. , Moreover, the proposed approach can obviously be extended to other methods for growing ZnO nanowires − or other quasi-1D nanostructures or composites …”

Section: Discussionmentioning

confidence: 99%

“…Interestingly, ZnO is also widely employed for surface acoustic wave devices, so that our approach could be easily extended to this important class of electromechanical resonators. 51 , 52 Moreover, the proposed approach can obviously be extended to other methods for growing ZnO nanowires 53 − 55 or other quasi-1D nanostructures or composites. 56 …”

Section: Discussionmentioning

confidence: 99%

ZnO Nanowires for Feedback-Assisted Tuning of Electromechanical Resonators

Orsini

Falconi

2022

ACS Appl. Nano Mater.

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The fabrication of devices with accurately controlled properties almost invariably takes advantage of feedback so that, based on real-time measurements, process parameters can be automatically adjusted in order to obtain the desired characteristics. Nevertheless, despite the outstanding advantages of wet-chemistry methods (e.g., simplicity, low-cost, low-temperature, and compatibility with almost any process and type of substrate), the use of feedback in the solution growth of nanostructures is almost unexplored. In fact, conventional techniques for the real-time in-liquid characterization of nanostructures are extremely complex and can introduce intricate artefacts. Here, by taking advantage of an electro-mechanical resonator as a substrate, we on-line monitor, at the system level, the nanostructure growth, thus enabling the feedback-assisted tuning of low-cost electro-mechanical resonators by ZnO nanowires. This approach allows for post-fabrication tuning of the resonant frequency with high accuracy and high tuning range (e.g., about 1% in our experiments) in a simple, fast, low power, and low-cost manner, without requiring expensive facilities such as clean rooms or high-vacuum deposition systems. Moreover, remarkably, we find that for a given desired resonant frequency, the quality factor of the resonance can be separately adjusted by modifying the nutrient solution, which can be a key advantage for filters. The straightforward interfacing and packaging of the final resonator stems from the large difference, about 5 orders of magnitude, between the key structure dimensions, namely, the diameter of the ZnO nanowires and the much larger (e.g., few millimeters) diameter of the quartz. Our results can lead to the widespread application of nanowire-tuned electro-mechanical oscillators and filters in electronics, sensors, and material science.

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Wet-Chemical Synthesis of ZnO Nanowires on Low-Temperature Photo-Activated ZnO-rGO Composite Thin Film with Enhanced Photoconduction

Cited by 11 publications

References 50 publications

Optical Characterization of Cesium Lead Bromide Perovskites

Optical Characterization of Cesium Lead Bromide Perovskites

Inhibition of α‐glucosidase activity by curcumin loaded on ZnO@rGO nanocarrier for potential treatment of diabetes mellitus

ZnO Nanowires for Feedback-Assisted Tuning of Electromechanical Resonators

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