Optical measurements on tailored zinc oxide thin films under optimal

Prasad, R. Haarindra; Hashim, U.; Gopinath, Subash C. B.; Veeradasan, P.; Liu, Weiwen; Rao, B. Sharma; Thivina, V.

doi:10.1016/j.ijleo.2015.12.052

Cited by 7 publications

(7 citation statements)

References 22 publications

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“…This conclusively states that the fabricated ZnO-Nanorods exists as pure hexagonal wurtzite structures and possess a preferred c-axis orientation. The crystallite sizes of ZnO were also determined using Scherrer equations to be 52 nm which correspondence to values obtained by previous reports 24, 28 . The values also correlate well with the average grain size determined from AFM analysis (51.6 nm).…”

Section: Resultssupporting

confidence: 83%

“…According to the experimentally obtained results, average surface roughness (RMS) values of film heat-treated at 300 °C is around 9 nm which was significantly higher than the RMS values of films treated at higher temperatures. This although contradicts the other previous reports on RMS value’s correlation with annealing temperature, it still reinforces the choice of annealing temperature since metal oxides film with a rough surface are stated to have large surface area to volume ratio and reduced electron scattering center effect which correspondence to improved biosensing applications 24,25 .…”

Section: Resultscontrasting

confidence: 69%

“…On the other hand, due to prior treatment of ZnO sol-gels with increasing amounts of citrate counteractants, the interaction of the citrate ions with MEA neutralizes the stabilizer’s charges which in turn contribute to nanoparticle agglomeration. Thus, the resulting larger sized ZnO nanoparticles curbs the influence of quantum confinement effects 24,41,42 .

Figure 8Diagram of Tauc plot ( αhv ) 2 vs hv and respective band gap energy values (eV).…”

Section: Resultsmentioning

confidence: 99%

“…Based on XRD peaks of undoped ZnO-Nanorod, (002) was the peak that held the highest intensity, demonstrating to be the dominant plane of growth orientation and hence was used to perform further computations regarding the matrix’s structural and crystallite attributes 24,25 . The following formulae are utilized, where λ represent the X-ray wavelength of the incident Cu K˛ radiation (0.154056 nm), α and c are the lattice constants, D is the crystallite size and δ is the dislocation density defect.…”

Section: Resultsmentioning

confidence: 99%

See 3 more Smart Citations

Gold-Hybridized Zinc Oxide Nanorods as Real-Time Low-Cost NanoBiosensors for Detection of virulent DNA signature of HPV-16 in Cervical Carcinoma

Thevendran

Foo

Haarindraprasad

et al. 2019

Sci Rep

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Detection of host integrated viral oncogenes are critical for early and point-of-care molecular diagnostics of virus-induced carcinoma. However, available diagnostic approaches are incapable of combining both cost-efficient medical diagnosis and high analytical performances. To circumvent this, we have developed an improved IDE-based nanobiosensor for biorecognition of HPV-16 infected cervical cancer cells through electrochemical impedance spectroscopy. The system is fabricated by coating gold (Au) doped zinc oxide (ZnO) nanorods interfaced with HPV-16 viral DNA bioreceptors on top of the Interdigitated Electrode (IDE) chips surface. Due to the concurrently improved sensitivity and biocompatibility of the designed nanohybrid film, Au decorated ZnO-Nanorod biosensors demonstrate exceptional detection of HPV-16 E6 oncogene, the cancer biomarker for HPV infected cervical cancers. This sensor displayed high levels of sensitivity by detecting as low as 1fM of viral E6 gene target. The sensor also exhibited a stable functional life span of more than 5 weeks, good reproducibility and high discriminatory properties against HPV-16. Sensor current responses are obtained from cultured cervical cancer cells which are close to clinical cancer samples. Hence, the developed sensor is an adaptable tool with high potential for clinical diagnosis especially useful for economically challenged countries/regions.

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Section: Resultssupporting

confidence: 83%

Section: Resultscontrasting

confidence: 69%

Figure 8Diagram of Tauc plot ( αhv ) 2 vs hv and respective band gap energy values (eV).…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Gold-Hybridized Zinc Oxide Nanorods as Real-Time Low-Cost NanoBiosensors for Detection of virulent DNA signature of HPV-16 in Cervical Carcinoma

Thevendran

Foo

Haarindraprasad

et al. 2019

Sci Rep

View full text Add to dashboard Cite

show abstract

“…Experimental Tauc plots were digitized from 73 plots collected from 63 published works, and the extracted slope values were collected into a histogram binned by order of magnitude. Additionally, the collected slopes, NEAR values, and reported and fitted E g values are shown in the Supporting Information.…”

Section: Resultsmentioning

confidence: 99%

Assessing Tauc Plot Slope Quantification: ZnO Thin Films as a Model System

Coulter

Birnie

2017

Physica Status Solidi (b)

214

107

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One of the most frequently used methods for characterizing thin films is UV–Vis absorption. The near‐edge region can be fitted to a simple expression where the intercept gives the band gap and the fitting exponent identifies the electronic transition as direct or indirect. [See Tauc et al., Physica Status Solidi 15, 627 (1966); naturally, these are usually called “Tauc” plots.] In earlier work, we found that direct band gaps fitted using Tauc's method can be quite accurate, to ∼1% [see Viezbicke et al., Phys. Status Solidi B 252, 1700 (2015)]. Still, slopes of these Tauc plots are less frequently quantified, even though the slopes are directly rooted in key band‐structure parameters. In this study, we examine the reproducibility of Tauc plot slopes for ZnO as a model direct‐gap material and compare these experimental values with the theoretically derived slope. In contrast to the band gap accuracy, the experimental slope values varied by several orders of magnitude. The histogram of slope values was significantly more compact for Tauc plots exhibiting less Urbach tail contribution. In these cases, the Tauc slopes can provide an order‐of‐magnitude quantification of other key band characteristics such as carrier effective mass.

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Effect of aging on microstructural and optical properties of sol-gel dip coated BaTiO3 thin films

Kaushik¹,

Kumar

et al. 2023

Applied Surface Science Advances

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Optical measurements on tailored zinc oxide thin films under optimal

Cited by 7 publications

References 22 publications

Gold-Hybridized Zinc Oxide Nanorods as Real-Time Low-Cost NanoBiosensors for Detection of virulent DNA signature of HPV-16 in Cervical Carcinoma

Gold-Hybridized Zinc Oxide Nanorods as Real-Time Low-Cost NanoBiosensors for Detection of virulent DNA signature of HPV-16 in Cervical Carcinoma

Assessing Tauc Plot Slope Quantification: ZnO Thin Films as a Model System

Effect of aging on microstructural and optical properties of sol-gel dip coated BaTiO3 thin films

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