Preparation and processing of doped AlN nanopowders

Grabis, Jānis; Šteins, Ints; Patmalnieks, Aloizijs; Bērziņa, B.; Trinklere, Laima

doi:10.3176/eng.2009.4.03

Cited by 3 publications

(2 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…AlN nanopowder (NP) consisting of polycrystalline grains with average size of 60 nm was synthesized in Institute of Inorganic Chemistry, Riga Technical University by using plasma-chemical synthesis [10]. Raw aluminum powder (99.4%) with particle size in the range of 20-40 µm was injected and evaporated into nitrogen (99.9%) high-frequency plasma flow.…”

Section: Methodsmentioning

confidence: 99%

Luminescent AlN:Mn nanoparticles for optical imaging of biological materials

Bērziņa¹,

Trinkler²,

Korsaks³

et al. 2020

Biophysical Bulletin

View full text Add to dashboard Cite

Background: Elaboration of new luminescent nanomaterials for imaging of biological materials including cells of living organisms and their parts is highly actual. These materials must meet a number of requirements such as low toxicity, inherence of intensive luminescence, low costs of raw material and symple synthesis methods. AlN nanopowder is one of such prospective materials fitting the above requirements. Our long time investigations on spectral characteristics for III group element nitrides allows chose of doped AlN nanopowder as prospective candidate for developing of luminescent markers for imaging of biological materials. Objectives: The aim of the present study is spectral characterization of AlN nanopowder doped with Mn and evaluation of its use as luminescent marker for biological materials. Materials and methods: AlN nanopowder with average size of polycrystalline grains of 60 nm and the same doped with Mn were sythesized in Institue of Inorganic Chemistry, Riga Technical University. Photoluminescence and its excitation spectra of the materials were studied at room temperature using a self-made set-up. Results: It was found that in undoped AlN nanopowder at room temperature luminescence of native defects forms a wide and complex band peaking at 415 nm. This blue luminescence can be excited with ultraviolet light from two spectral regions around 315–340 nm and 260 nm. Two luminescence mechanisms are proposed dependent on the spectral region of exciting light. The first of them results in the intra-center luminescence, but the second one is recombination luminescence. Incorporation of Mn atoms in the crystalline lattice of AlN nanopowder forming AlN:Mn NP results in appearance of intensive red luminescence at 600 nm, which can be excited with light from two excitation bands at 260 and 480 nm. Two mechanisms responsible for an appearence of the red luminescence of Mn are proposed. They are the intra-center luminescence and recombination luminescence mechanisms. In this case the red Mn luminiscence prevails and the blue luminescence characterizing the host material has not been observed. Conclusion: AlN nanopowder doped with Mn atoms is a prospective material for use as luminescent marker for imaging of biological materials. Properties of this material are in a good agreement with the main requirements obligated to biological materials: i) AlN NP has low toxicity; ii) AlN:Mn NP possesses intensive red luminescence at 600 nm, which can be excited either with the ultraviolet light around 260 nm or with visible light around 480 nm; iii) it is relatively cheep material and it can be synthesized using simple synthesis methods.

show abstract

Section: Methodsmentioning

confidence: 99%

Luminescent AlN:Mn nanoparticles for optical imaging of biological materials

Bērziņa¹,

Trinkler²,

Korsaks³

et al. 2020

Biophysical Bulletin

View full text Add to dashboard Cite

show abstract

“…AlN also has optical characteristics [4]. The properties of AlN are strongly influenced by chemical purity, density and structure [5]. Of Science And Technology, Dr. Shakuntala Misra National Rehabilitation University, Lucknow, Uttar Pradesh -226017 (India).Email-Ckdixit@Dsmnru.Ac.In Kapil Pandey, 1 Thermal management has always been a major concern in the design of high frequency and power electronic devices.…”

Section: Introductionmentioning

confidence: 99%

Structural, Optical and Frequency Dependent Electrical Behaviour of Aluminum Nitride (ALN) Nanopowder

Dixit*¹,

Pandey²

2019

IJRTE

View full text Add to dashboard Cite

Aluminum nitride (AlN) is ceramic material. It has very high thermal and low electrical conductivity. The Variation of Various Electrical Parameters viz. Impedance (Z), Admittance (Y), Dielectric Permittivity ('), Relative Loss (''), Electrical Conductivity (), and Loss Tangent (Tan ) with frequency Dependence of Aluminum Nitride (AlN) Nano powder were studied. Scanning electron microscopy (SEM); Raman Spectroscopy; and X-ray diffraction (XRD) were used to analyse the surfaces and structures of aluminum nirtride nanopowder. It has been found that the particle size is of 36.15 nm and the crystallographic structure is amorphous. The surface morphology of the studied compound has been investigated by Scanning Election Microscopy (SEM) indicating the particles are in nanosize and characteristic range of diameters are in nanoscale. The electrical studies of the studied compound have been examined in order to acquire the electrical parameters (mainly dielectric permittivity, loss, conductivity, loss-tangent, impedance, and admittance). Small rise in the conductivity (with frequency dependent) has been observed due to the decrease in the particle size of the material.it is also observed that the relative permittivity ('), relative loss '') and dissipation factor (Tan ) decreases with increase in frequency. The Raman shift variation with the intensity which shows the peaks of the compound are obtained at 506 cm-1 , 615 cm-1 656 cm-1 , 873 cm-1 , 882 cm-1 , 949 cm-1 , and 974 cm-1 using laser at 785 nm.

show abstract