Organic–Inorganic Composite Films Based on Gd₃Ga₃Al₂O₁₂:Ce Scintillator Nanoparticles for X-ray Imaging Applications

Abstract

Organic-inorganic nanocomposite self-standing films of GdGaAlO (GGAG) uniformly dispersed in poly(methyl methacrylate) (PMMA) and polystyrene polymer are prepared for radiography application. GGAG:Ce nanoscintillator has been chosen because of its high light output and fast decay time. The nanopowder of GGAG is synthesized by coprecipitation method and dispersed in the polymer matrix by a simple blending technique. The nanocomposite films of thickness in the range of 150-450 μm with a very high inorganic content is achieved by this technique. These films are characterized by their uniformity, optical absorption, photoluminescence, and radioluminescence. These films are further tested for their application in radiography by recording X-ray images using a commercially available charge-coupled device camera. A resolution of 10 lp/mm is obtained using GGAG:PMMA composite film with 50% loading, confirming their application in imaging devices.

An Ultrasensitive Fluorescence Sensor with Simple Operation for Cu2+ Specific Detection in Drinking Water

“…However, the Cu 2+ detection was influenced by ions such as Hg 2+ , Fe 3+ , and Zn 2+ . 30−34 In our investigation, the detection principle was based on the intrinsic catalytic property of Cu 2+ , which helps to eliminate the interference of other metal ions. It was noted that though Fe 3+ has catalytic activity, it does not cause any fluorescence change of the “detection kit” since Fe 3+ usually presents a catalytic property in acidic condition, 48 while the Cu 2+ determination in our investigation was conducted in neutral buffer solution that inhibits the catalytic property of Fe 3+ and its interference correspondingly.…”

Modeling and Monte Carlo simulation on photothermal effect in Gd3Al3Ga2O12:Ce3+/Y3Al5O12:Cr3+ layered composite ceramic

“…𝑠𝑛 ← 𝑠𝑛 ⋅ 𝜑 t1 𝜑 t2 (25) n 1 , φ t1 are the refractive index and interaction coefficient of the current layer, and n 2 , φ t2 are those of the next layer.…”

“…Considering the convenience and feasibility of the procedure, this paper selects the wavelengths of the peaks of the spectrum as the wavelengths of the excitation photons, which is because the spectral peak represents the number of photons at this wavelength is the largest. The optical parameters of ceramics (including absorption coefficient, scattering coefficient, anisotropy factor, and refractive index) change with the TA B L E 1 The optical parameters of ceramics under excitation photons with wavelengths of 460, 558, and 700 nm [25][26][27][28][29][30][31] wavelength of light, so in addition to the corresponding optical parameters of the original incident 460 nm light, this paper also needs the optical parameters corresponding to the 558 nm wavelength laser excited by Ce 3+ in the first layer and the optical parameters corresponding to the 700 nm wavelength laser excited by Cr 3+ ions in the second layer. The photon wavelengths used in the simulation and the corresponding optical properties of each layer are shown in Table 1.…”

Terbium doped LiLuF4 nanocrystal scintillator-based flexible composite film for high resolution X-ray imaging

“…Shashwati Sen and his coworkers successfully obtained composite thin film materials by mixing Gd 3 Ga 3 Al 2 O 12 :Ce (GGAG:Ce) nanoparticles with polymethyl methacrylate (PMMA) or polystyrene (PS) and reported their X-ray imaging application. 17 The imaging capability of GGAG:Ce-PMMA composite film was characterized by commercial CCD camera and the final imaging resolution can reach 10 LP per mm, despite the poor transparency of the imaging film. However, as a composite material, there is an inherent contradiction between high load of nanomaterials and transparency for composite film.…”