A facile microwave synthesis of rGO, ZrO2 and rGO–ZrO2 nanocomposite and their room temperature gas sensing properties

Krishnakumar, Akshay; Srinivasan, P. Bala; Kulandaisamy, Arockia Jayalatha; Babu, K. Jayanth; Rayappan, John Bosco Balaguru

doi:10.1007/s10854-019-02056-8

Cited by 13 publications

(7 citation statements)

References 67 publications

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“…[ 46 ] This significant change in the height ratio observed between Al and Al 2 O 3 elucidated the formation of higher contents of aluminum oxide compounds on the laser‐ablated surface. [ 47,48 ] Similarly, the peak occurrence at 290 eV is due to the presence of sp 2 carbon [ 49 ] allotropic network in the parchment paper. Unattributed peaks such as ‐CF 2 were observed on the surface of the pristine Al sample which is explained by the carbon contamination and impurities on the Al film.…”

Section: Resultsmentioning

confidence: 99%

“…Unattributed peaks such as ‐CF 2 were observed on the surface of the pristine Al sample which is explained by the carbon contamination and impurities on the Al film. [ 49 ] However, after laser ablation, the impurity peaks corresponding to CF 2 bonds were diminished with CO formation on the surface. A noticeable increase in the CO peak intensity of the laser‐ablated samples was observed.…”

Section: Resultsmentioning

confidence: 99%

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Wireless Humidity Sensor for Smart Packaging via One‐step Laser‐Induced Patterning and Nanoparticle Formation on Metallized Paper

Gopalakrishnan

Sedaghat

Krishnakumar

et al. 2022

Adv Elect Materials

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In this work, a scalable and rapid process is developed for creating a low‐cost humidity sensor for wireless monitoring of moisture levels within packaged goods. The sensor comprises a moisture‐sensitive interdigitated capacitor connected to a planar spiral coil, forming an LC circuit whose resonant frequency is a function of environmental humidity. The sensor is fabricated on a commercially available metallized parchment paper through selective laser ablation of the laminated aluminum (Al) film on the parchment paper substrate. The laser ablation process provides a unique one‐step patterning of the conductive Al layer on the paper while simultaneously creating high surface area Al2O3 nanoparticles within the laser‐ablated regions. The intrinsic humidity‐responsive characteristics of the laser‐induced Al2O3 nanostructures provide the wireless sensor with a tenfold higher sensitivity to humidity than a similar LC resonant sensor prepared by conventional photolithography‐based processes on FR‐4 substrates. The frequency change of the sensor is observed to be a linear function within the range of 0−85% RH, providing an average sensitivity of −87 kHz RH−1 with good repeatability and stable performance. Furthermore, the employment of scalable laser fabrication processes using commercially available inexpensive materials renders these technologies viable for roll‐to‐roll manufacturing of low‐cost wireless sensors for smart packaging applications.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Wireless Humidity Sensor for Smart Packaging via One‐step Laser‐Induced Patterning and Nanoparticle Formation on Metallized Paper

Gopalakrishnan

Sedaghat

Krishnakumar

et al. 2022

Adv Elect Materials

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“…The existence of the carbon (C) 1s peak was attributed to the adsorbed CO 2 on the surface of the material. 28,29 The deconvolution of Zr 3d high-resolution X-ray photoelectron spectroscopy spectra (HR-XPS) (Fig. 2A (b)) reveals spin-orbit splitting of the Zr 3d at 185.3 eV (Zr 3d 3/2 ) and 182.9 eV (Zr 3d 5/2 ) 30 for the tetragonal phase of ZrO 2 .…”

Section: Resultsmentioning

confidence: 99%

Amine Functionalized Noble Metal: Metal Oxide Nanohybrid for Efficient Electrochemical Determination of 25-Hydroxy Vitamin-D₃ in Human Serum

Chauhan¹,

Gupta²,

Solanki³

2021

J. Electrochem. Soc.

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Quantification of 25-hydroxy vitamin-D3 (25-OHVD3) is important because its deficiency is related to numerous diseases, including osteoporosis, depression, diabetes, heart disease, certain autoimmune conditions, and even Covid-19. In the present study, noble metal-metal oxide nanohybrid based on L-cysteine functionalized gold decorated zirconia nanoparticles (Cys-Au@ZrO2 NPs) were synthesized with the objective of enhanced electrochemical behavior, stability, availability of functional group to covalently bind with biomolecules, and developing an efficient immunosensor for 25-OHVD3 detection. The formation of Au@ZrO2 NPs and further Cys functionalization was validated by various characterizations. Cys-Au@ZrO2 NPs were electrodeposited onto ITO substrate and further modified with antibodies specific to 25-OHVD3 (ab-25VD3) and bovine serum albumin (BSA) to build an immunosensing platform for 25-OHVD3 detection. The fabricated BSA/ab-25VD3/Cys-Au@ZrO2/ITO immunosensor demonstrated an improved sensitivity of 2.01 μA ng−1 ml cm−2, LOD of 3.54 ng ml−1 for the linear detection range of 1–50 ng ml−1 with regression constant of 0.98. Moreover, the analytical performance of the BSA/ab-25VD3/Cys-Au@ZrO2/ITO immunosensor in determining 25-OHVD3 in human serum samples collected from four healthy people yielded satisfactory results that were highly correlated with the conventional enzyme-linked immunosorbent assay (ELISA).

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“…For Zr 3d in the Fe/Zr-0 (Fig. 2(a)), a doublet concentrated on 181.7 and 184 eV can be fitted into the Zr 3d 5/2 and Zr 3d 3/2 , respectively; 45,46 an observable Zr 3d peak from Fe/Zr-x (x = 1, 2 and 4) shifts B0.3 eV toward higher binding energy (BE) counter to that of Fe/Zr-0, respectively. The Fe 2p and O 1s spectra of Fe/Zr-x are figured out (Fig.…”

Section: Materials Characterizationmentioning

confidence: 99%

Enhanced acetic acid sensing of MOF-derived α-Fe₂O₃/ZrO₂ arising from phase junction and defects

et al. 2022

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A facile microwave synthesis of rGO, ZrO2 and rGO–ZrO2 nanocomposite and their room temperature gas sensing properties

Cited by 13 publications

References 67 publications

Wireless Humidity Sensor for Smart Packaging via One‐step Laser‐Induced Patterning and Nanoparticle Formation on Metallized Paper

Wireless Humidity Sensor for Smart Packaging via One‐step Laser‐Induced Patterning and Nanoparticle Formation on Metallized Paper

Amine Functionalized Noble Metal: Metal Oxide Nanohybrid for Efficient Electrochemical Determination of 25-Hydroxy Vitamin-D₃ in Human Serum

Enhanced acetic acid sensing of MOF-derived α-Fe₂O₃/ZrO₂ arising from phase junction and defects

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A facile microwave synthesis of rGO, ZrO2 and rGO–ZrO2 nanocomposite and their room temperature gas sensing properties

Cited by 13 publications

References 67 publications

Wireless Humidity Sensor for Smart Packaging via One‐step Laser‐Induced Patterning and Nanoparticle Formation on Metallized Paper

Wireless Humidity Sensor for Smart Packaging via One‐step Laser‐Induced Patterning and Nanoparticle Formation on Metallized Paper

Amine Functionalized Noble Metal: Metal Oxide Nanohybrid for Efficient Electrochemical Determination of 25-Hydroxy Vitamin-D3 in Human Serum

Enhanced acetic acid sensing of MOF-derived α-Fe2O3/ZrO2 arising from phase junction and defects

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Amine Functionalized Noble Metal: Metal Oxide Nanohybrid for Efficient Electrochemical Determination of 25-Hydroxy Vitamin-D₃ in Human Serum

Enhanced acetic acid sensing of MOF-derived α-Fe₂O₃/ZrO₂ arising from phase junction and defects