Cerium oxide nanoparticles: Size-selective formation and structure analysis

Zhang, Feng; Chan, Siu‐Wai; Spanier, Jonathan E.; Apak, Ebru; Jin, Qinghao; Robinson, Richard D.; Herman, Irving P.

doi:10.1063/1.1430502

Cited by 646 publications

(450 citation statements)

References 13 publications

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“…[23][24][25] The reference spectrum of Mefp-1 shows major characteristic peaks of the functional group DOPA. The small peak at 1700 cm −1 (amid I) is almost entirely due to the C=O stretching vibration.…”

Section: Resultsmentioning

confidence: 99%

Thin Composite Films of Mussel Adhesive Proteins and Ceria Nanoparticles on Carbon Steel for Corrosion Protection

Sababi¹,

Zhang²,

Krivosheeva³

et al. 2012

J. Electrochem. Soc.

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Thin composite films of the mussel adhesive proteins (Mefp-1) and ceria nanoparticles were deposited on substrate surfaces by alternating immersions. The film formation was studied by quartz crystal microbalance with dissipation (QCM-D) monitoring. Both the changes in frequency and dissipation recorded by QCM-D demonstrate buildup of a composite film of Mefp-1 and nanoceria. Micro-and nanostructure and composition of the film on carbon steel were characterized by optical and atomic force microscopy (AFM), electron probe micro analyzer (EPMA) and confocal Raman microspectroscopy (CRM). Optical and EPMA observations of the film show micron-sized aggregates and AFM imaging of the compact and smooth areas reveal the nanostructure. EPMA elemental mapping indicates that the micron-sized aggregates are rich in ceria and Mefp-1, whereas CRM analysis shows the presence of Mefp-1-Fe complexes in the film. Corrosion protection of the composite film on carbon steel was investigated by electrochemical impedance spectroscopy and potentiodynamic polarization measurements in NaCl solution, and compared with Mefp-1 added in the solution as an inhibitor. The measurements show that the composite film provides a higher corrosion resistance compared with Mefp-1 added as inhibitor. The corrosion resistance increases with exposure time and approaches a high level. Corrosion inhibitors are widely used to control corrosion of metallic materials that causes huge economic cost to our society, and even catastrophes due to unexpected failure of metallic constructions and devices. In the past decade, extensive efforts have been devoted to developing new "green" corrosion inhibitors to replace traditional ones that are harmful to human health and ecological systems.1 Filmforming inhibitors based on organic substances that are more "green" for human and environment have attracted considerable attention in recent years. For example, a mussel adhesive protein (MAP), derived from marine mussel Mytilus edulis, has shown a certain inhibition effect on stainless steel.2 In our previous study, Mefp-1, the type of MAP that has been most studied, was shown to exhibit interesting inhibiting properties on carbon steel in NaCl solutions. However, the inhibition efficiency of Mefp-1 is limited since the adsorbed film is not sufficiently compact, and this is particularly a problem for the initial period during which Mefp-1 does not give a significant inhibition effect. 3The adhesive and cohesive properties of MAP are generally attributed to the high content of di-hydroxyphenylalanine (DOPA), 4 which has been reported to form complexes with metal ions 5,6 and metal oxides. Waite et al. have concluded that the DOPA moiety in the proteins serves two important roles in MAP adhesion to many surfacesthe formation of interfacial complexes promoting chemisorption and cross-links. 8,9 In another study of adsorption and corrosion protection of polydopamine based surface films on aluminum alloys, it was concluded that these self-assembled surface films can provide a c...

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Section: Resultsmentioning

confidence: 99%

Thin Composite Films of Mussel Adhesive Proteins and Ceria Nanoparticles on Carbon Steel for Corrosion Protection

Sababi¹,

Zhang²,

Krivosheeva³

et al. 2012

J. Electrochem. Soc.

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“…Therefore, this mode should be very sensitive to any disorder in the oxygen sublattice resulting from thermal and/or grain size induced nonstoichiometry. The influence of the microstructure on the shape of the Raman spectrum was observed by the Raman shift and the width of the Raman mode [18][19][20][21][22][23]. Figure 8 shows the variation in FWHM and Raman line shift as a function of substrate temperature.…”

Section: Thin Filmsmentioning

confidence: 99%

Microstructural studies of bulk and thin film GDC

Muthukkumaran

Kuppusami

Kesavamoorthy

et al. 2007

Ionics

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Ceria rare earth solid solutions are known as solid electrolyte with potential application in oxygen sensors and solid oxide fuel cells. We report the preparation of gadolinia-doped ceria, Ce 0.90 Gd 0.10 O 1.95 , by the conventional solid-state reaction method and the preparation of thin films from a sintered pellet of gadolinia-doped ceria by the pulsed laser deposition technique. The effect of process conditions, such as substrate temperature, oxygen partial pressure, and laser energy on microstructural properties of these films are examined using powder X-ray diffraction, scanning electron microscopy, atomic force microscopy, and Raman spectroscopy.

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“…In another experiment, we examine a reaction proposed in the literature. It is believed that hexamethylenetetramine (HMT, C 6 H 12 N 4 ) decomposes by water to form formaldehyde and ammonia vapour above 60uC, which dissociates further to form ammonium cations and hydroxyl anions as shown in equation (ii) 46 [48][49][50][51][52][53][54] . In this context, it may be noted that the growth of these oxides takes place above ,60uC.…”

Section: Discussionmentioning

confidence: 99%

Nanocomposite based flexible ultrasensitive resistive gas sensor for chemical reactions studies

pandey¹,

Pandey²,

Goswami³

et al. 2013

Protocol Exchange

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Room temperature operation, low detection limit and fast response time are highly desirable for a wide range of gas sensing applications. However, the available gas sensors suffer mainly from high temperature operation or external stimulation for response/recovery. Here, we report an ultrasensitive-flexiblesilver-nanoparticle based nanocomposite resistive sensor for ammonia detection and established the sensing mechanism. We show that the nanocomposite can detect ammonia as low as 500 parts-per-trillion at room temperature in a minute time. Furthermore, the evolution of ammonia from different chemical reactions has been demonstrated using the nanocomposite sensor as an example. Our results demonstrate the proof-of-concept for the new detector to be used in several applications including homeland security, environmental pollution and leak detection in research laboratories and many others.A mmonium nitrate is present in many explosives and is known to gradually decompose and release trace amounts of ammonia. It is, therefore, essential to detect a trace of the gas to prevent the fatal accidents. The variation of conductivity of metal oxides and conducting polymers has been explored for the detection of ammonia in ppb (parts-per-billion) range. The conventional solid state and conducting polymer sensors suffer from ultralow detection at room temperature . The commercially available conducting polymer sensors require high power consumption since they provide adequate sensitivity only at high temperatures. Intense research is underway to develop new sensing materials and devices for a wide range of applications, especially, at room temperature. It has been shown that the graphene and carbon nanotube based detectors can operate at room temperature [27][28][29][30][31][32] . However, it is required to supply air or oxygen along with ammonia and apply either a current of 100 mA or UV illumination in order to clean the adsorbed gas molecules for sensor recovery [27][28][29][30][31][32] . A self-activated highly sensitive graphene 32 or metal oxide nanostructures 33 have been reported where the response time is few minutes.An ideal sensor should possess the following significant features: (i) operation at room temperature; (ii) working in ambient environment and no requirement of oxygen or air supply; (iii) no external stimulus such as Joule heating or UV illumination for response/recovery; (iv) low detection limit; (v) high sensitivity and reproducibility; (vi) fast response and recovery; (vii) low cost and eco-friendly, etc. We have previously reported the aqueous ammonia sensing of guar gum/silver nanoparticles (GG/Ag) solutions based on the variation of the surface plasmon resonance (SPR) peaks 34 . Limitations of the method are that the solution cannot be reused and the detection limit is ppm level. Here, we report an ultrasensitive chemiresistor sensor based on GG/Ag nanocomposite for ammonia detection. The conductance of the sensor increases and the change is shown to be improved by increasing the loading of Ag n...

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Cerium oxide nanoparticles: Size-selective formation and structure analysis

Cited by 646 publications

References 13 publications

Thin Composite Films of Mussel Adhesive Proteins and Ceria Nanoparticles on Carbon Steel for Corrosion Protection

Thin Composite Films of Mussel Adhesive Proteins and Ceria Nanoparticles on Carbon Steel for Corrosion Protection

Microstructural studies of bulk and thin film GDC

Nanocomposite based flexible ultrasensitive resistive gas sensor for chemical reactions studies

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