Structural properties of ordered porous SnO2 nanostructure

Abstract

Three-dimensional porous ordered SnO2 nanostructures have been fabricated by templating a sol–gel pre- cursor solution against the polystyrene nanospheres for the first time. Field emission scanning electron micrography (FESEM) indicates that the surface of the nanostructures is highly regular and the porous structures are perfectly ordered. Besides a broad emission band at 600 nm, the porous SnO2 nanostructures show an additional emission band at 430 nm, which is seldom seen in the bulk SnO2 materials. Spectral examinations and analyses reveal that the 430 nm band is induced by the interfacial effects between the porous frameworks.

Combined experimental and theoretical investigation of electronic properties of nitrides

“…The GaN absorption spectra have been already discussed, [13][14][15] but importantly, with the spectra recorded for different polarization we were able differentiate contributions of u and rr bonds to the particular structures in the density of states. Figure 1(a) contains the experimental emission and absorption spectra at the K edge of nitrogen, which correspond to contribution of p states of N to the valence and conduction bands, respectively.…”

“…Several theoretical studies of III-V nitrides have been published but surprisingly, relatively few experimental studies of the band structure have been carried out [8][9][10][11][12] except for BN. Only recently some x-ray studies concerning mainly GaN have been published [13][14][15][16]. The shape of the x-ray spectra is a fingerprint of the particular chemical bond and makes it possible to identify the chemical nature of the bond formed by selected kind of atoms in different com-pounds.…”

Carbon nanomaterials for biomedicine applications

“…Since the biological structures' dimensions are similar to carbon nanostructures, they create effective drug delivery system applicants [8]. Given that carbon nanostructures can be easily synthesized, they can be linked to therapeutics such as chemotherapeutics, antitumor drugs, and antibodies [2,3,15].…”

“…Biomedical researchers have struggled to figure out the convenient materials for diagnosis and therapeutic applications [2]. Recently, significant progress has been attempted forward into the employ of carbon nanomaterials in medical field [3]. Since carbon nanomaterials are varied in structure, have large surface-to-volume ratios, easy fabrication, and unique optical characteristics on top of that, they have a lot going for them in biomedicine research [4].…”

Optical properties of HfO2 nanostructures for optoelectronic device

“…Hafnium dioxide is a promising material with a high dielectric constant and a wide band gab ~ 5 e.V as well as chemical stability on Si high temperatures and a good thermal conductivity [1][2][3][4][5]. HFO2 has a high reflective index ~2 [6][7][8] and a high reaction free energy with silicon about 79.6 kcal/mol at 1000 K compared with TiO2 and Ti2O5 [9][10][11][12][13]. In addition, HFO2 is a high refactory material with excellent chemical and physical properties which are led to use the HFO2 films in many applications [14][15][16][17][18].…”