Investigation of Annealing Temperature on Structural and Morphological Properties of Cr2O3 Nanoparticles for Humidity Sensor Application

Jayamurugan, P.; Mariappan, R.; Premnazeer, K.; Ashokan, S.; Rao, Yammani Venkat Subba; Rao, N. V. S. S. Seshagiri; Shanmugapriya, C.

doi:10.1007/s11220-017-0170-y

Cited by 7 publications

(1 citation statement)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the other hand, the spectra in Figures 2-4 showed a characteristic absorption peak for metal oxide nanoparticles, which was matching with the literature. e spectrum appears as bands at 247, 391, and 246 nm attributed to Nd 2 O 3 , Cr 2 O 3 , and V 2 O 3, respectively [64][65][66].…”

Section: Infrared Spectramentioning

confidence: 99%

Nd2O3, Cr2O3, and V2O3 Nanoparticles via Calcination: Synthesis, Characterization, Antimicrobial and Antioxidant Activities

Al-Fakeh

Al-Otaibi

2022

Journal of Nanotechnology

View full text Add to dashboard Cite

Nd2O3, Cr2O3, and V2O3 nanoparticles were prepared by calcining the precursor materials that are novel mixed ligand complexes: [Nd(BDC)(ADMPY)(OAc)].H2O, [Cr(BDC)(ADM PY)Cl].H2O, and [V(BDC)(ADMPY)Cl].H2O, where BDC = 1,4-benzenedicarboxylic acid and ADMPY = 2-amino-4,6-dimethyl pyrimidine. The generated compounds were examined through several techniques such as elemental analysis (C.H.N), UV-Vis spectroscopy, thermal analysis (thermogravimetric, differential thermogravimetry, and differential thermal analysis), FT-IR spectra, X-ray diffraction (XRD), scanning electron microscope (SEM), and transmission electron microscope (TEM). The TEM micrographs showed that neodymium oxide nanoparticles assumed agglomerated platelet-like particles, with particle sizes around 30.16 nm, while chromium oxide NPs showed solid block material with compact density and fewer pores with nearly spherical shape and 56.12 nm size. The vanadium oxide NPs were an agglomeration of small spherical nanoparticles of 28.4 nm size. The antimicrobial properties of the samples were assessed using two strains of Gram-positive bacteria, two strains of Gram-negative bacteria, and one strain of yeast. The antimicrobial results demonstrated that a large spectrum of activity characterizes the tested compounds because they are active on Gram-positive and Gram-negative bacteria, especially on Gram-positive strains. The antioxidant activity of prepared compounds was assessed by scavenging free radicals of DPPH. Metal oxide NPs also showed promising results as antioxidants.

show abstract

Section: Infrared Spectramentioning

confidence: 99%

Nd2O3, Cr2O3, and V2O3 Nanoparticles via Calcination: Synthesis, Characterization, Antimicrobial and Antioxidant Activities

Al-Fakeh

Al-Otaibi

2022

Journal of Nanotechnology

View full text Add to dashboard Cite

show abstract

Efficient Fabrication of CrFeO₃‐Based Humidity Sensing Device with Fast Dynamics for Real‐Time Breath Monitoring and Contact‐Less Sensing

Dhariwal,

Yadav,

Kumari

et al. 2024

Part & Part Syst Charact

View full text Add to dashboard Cite

In this study, a simple and cost‐effective method is presented for developing a metal oxide‐based humidity sensor. CrFeO3 is synthesized without any precipitating agent and chosen as a model material to study the validity of humidity sensing properties. The surface morphology and structural analysis are provided using field emission scanning electron microscope (FESEM), transmission electron microscope (TEM), X‐ray diffraction (XRD), and Brunauer–Emmett–Teller (BET) analysis. Elemental analysis is provided with the help of X‐ray photoelectron spectroscopy (XPS). Obtained results demonstrate the tunable response of order 860 and stability in a large range of humidity. Also, by controlling the porosity and film uniformity, a fast response time of 1.6 s and a recovery time of 2.6 s are achieved with very low hysteresis. Also, cole–cole plot and Fourier transform infrared spectroscopy (FTIR) spectra in the presence and absence of humidity provide detailed analysis of surface interaction with H2O molecules. In addition to this, the developed sensor demonstrates excellent response and reproducibility toward real‐time human respiration monitoring along with non‐contact sensing. This work enables the study of developed sensors in real‐time humidity monitoring for practical applications.

show abstract

Comprehensive study on morphological, structural and optical properties of Cr2O3 nanoparticle and its antibacterial activities

Kamari

Al‐Hada

Baqer

et al. 2019

J Mater Sci: Mater Electron

View full text Add to dashboard Cite

Chromium (III) oxide (Cr2O3) nanoparticles are generated by thermal treatment (calcination) of precursor materials such as chromium nitrate along with a poly (vinyl pyrrolidone) capping agent. The samples produced were characterised by various techniques, including Xray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX), transmission electron microscopy (TEM) and Fourier transform infrared spectroscopy (FT-IR). Examination results obtained from XRD showed that Cr2O3 nanoparticles exhibit hexagonal crystalline structures, with the presence of Cr and O in these novel materials being confirmed by results of analyses of both EDX and FT-IR. Results of TEM have pointed out that the average nanoparticle size was noticeably increased from 28 to 46 nm in relation to increase of calcination temperature of a range between 500 and 800 °C. The surface composition and valence state of the produced nanoparticles were examined by X-ray photoelectron spectroscopy (XPS), the optical energy gap has been evaluated using UV-visible reflectance spectra with the help of Kubelka-Munk equation. The energy band gap had a reversely proportional relationship with calcination temperature with a reduction in energy band gap from 3.12 to 3.01 eV. Photoluminescence (PL) spectra indicated an increase in photoluminescence with increasing particle size. The antibacterial activity of the Cr2O3 nanoparticles was evaluated in-vitro using gram-negative Escherichia coli ATCC 25922 and gram-positive Bacillus subtilis UPMC 1175.

show abstract

Investigation of Annealing Temperature on Structural and Morphological Properties of Cr2O3 Nanoparticles for Humidity Sensor Application

Cited by 7 publications

References 30 publications

Nd2O3, Cr2O3, and V2O3 Nanoparticles via Calcination: Synthesis, Characterization, Antimicrobial and Antioxidant Activities

Nd2O3, Cr2O3, and V2O3 Nanoparticles via Calcination: Synthesis, Characterization, Antimicrobial and Antioxidant Activities

Efficient Fabrication of CrFeO₃‐Based Humidity Sensing Device with Fast Dynamics for Real‐Time Breath Monitoring and Contact‐Less Sensing

Comprehensive study on morphological, structural and optical properties of Cr2O3 nanoparticle and its antibacterial activities

Contact Info

Product

Resources

About

Investigation of Annealing Temperature on Structural and Morphological Properties of Cr2O3 Nanoparticles for Humidity Sensor Application

Cited by 7 publications

References 30 publications

Nd2O3, Cr2O3, and V2O3 Nanoparticles via Calcination: Synthesis, Characterization, Antimicrobial and Antioxidant Activities

Nd2O3, Cr2O3, and V2O3 Nanoparticles via Calcination: Synthesis, Characterization, Antimicrobial and Antioxidant Activities

Efficient Fabrication of CrFeO3‐Based Humidity Sensing Device with Fast Dynamics for Real‐Time Breath Monitoring and Contact‐Less Sensing

Comprehensive study on morphological, structural and optical properties of Cr2O3 nanoparticle and its antibacterial activities

Contact Info

Product

Resources

About

Efficient Fabrication of CrFeO₃‐Based Humidity Sensing Device with Fast Dynamics for Real‐Time Breath Monitoring and Contact‐Less Sensing