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Differently synthesized gold nanoparticles respond differently to functionalization with L-amino acids

Particuology 2020年第5期18卷 97-104页

作者： Darshana V.Havaldar Reshma V.Patil disha n.moholkar Priyanka S.Magdum Akash P.Vadrale Kiran D.Pawar School of nanoscience and Biotechnology Shivaji UniversityKolhapurMaharashtraIndia

The potential utility of gold nanoparticles(AunPs)synthesized via different methods for biomedical applications vary greatly due to inherent differences in their surface *** the present study,we investigated the functionalization of AunPs synthesized by chemical reduction,plant extract,and bacteria-mediated methods with 22 L-amino *** produced by bacteria-mediated(B_AunPs)and plant-mediated(P_AunPs)methods showed good potential,as they were able to be functionalized with six(histidine,lysine,methionine,phenylalanine,tryptophan,and tyrosine)and four(cystine,tryptophan,tyrosine,and valine)amino acids,*** contrast,AunPs produced by chemical reduction(C_AunPs)were not found to be suitable for *** functionalization conditions were found to be amino acid concentration of 20-25 mM and neutral pH(7)for P_AunPs,whereas B_AunPs tolerated more variable *** electrophoretic mobility of P_AunPs after functionalization indicated that these nanoparticles were less sensitive than B_AunPs to the deviations from optimal conditions.A significant change in mobility was observed when B_AunPs were functionalized with either methionine or ***,the results of this study suggest that the suitability of the three differently synthesized AunPs with amino acids is in the following order:B_AunPs>P_AunPs>C_AunPs.

关键词： Gold nanoparticles Biogenic synthesis Amino acids Functionalization Electrophoretic mobility

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Structural and optoelectronic properties of sprayed Sb:SnO_2 thin films:Effects of substrate temperature and nozzle-to-substrate distance

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Journal of Semiconductors 2011年第10期32卷 1-9页

作者： A.R.Babar S.S.Shinde A.V.moholkar C.H.Bhosale K.Y.Rajpure Electrochemical Materials Laboratory Department of PhysicsShivaji University

The influence of substrate temperature and nozzle-to-substrate distance（nSD） on the structural,morphological, optical and electrical properties of Sb：SnO_2 thin films prepared by chemical spray pyrolysis has been *** structural,morphological,optical and electrical properties were characterized by using XRD,SEM, UV-visible spectrophotometry and Hall effect measurement *** was seen that the films are polycrystalline, having a tetragonal crystal structure with strong orientation along the（200） *** pyramidal crystallites formed due to coalescence were observed from SEM *** values of highest conductivity,optical transmittance and figure of merit of about 1449（Ω·cm）^（-1）,70%and 5.2×10^（-3）□/Ω,respectively,were observed for a typical film deposited using optimal conditions（substrate temperature = 500℃and nSD = 30 cm）.

关键词： substrate temperature nSD structural optoelectronic properties

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Physical properties of sprayed antimony doped tin oxide thin films:The role of thickness

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Journal of Semiconductors 2011年第5期32卷 10-17页

作者： A.R.Babar S.S.Shinde A.V.moholkar C.H.Bhosale J.H.Kim K.Y.Rajpure Electrochemical Materials Laboratory Department of PhysicsShivaji UniversityKolhapur-416 004India Department of Materials Science and Engineering Chonnam National University300 Yongbong-DongBuk-GuGwangju500-757South Korea

Transparent conducting antimony doped tin oxide （Sb：SnO2） thin films have been deposited onto pre- heated glass substrates using a spray pyrolysis technique by varying the quantity of spraying solution. The structural, morphological, X-ray photoelectron spectroscopy, optical, photoluminescence and electrical properties of these films have been studied. It is found that the films are polycrystalline in nature with a tetragonal crystal structure having orientation along the （211） and （112） planes. Polyhedrons like grains appear in the FE-SEM images. The average grain size increases with increasing spraying quantity. The compositional analysis and electronic behaviour of Sb：SnO2 thin films were studied using X-ray photoelectron spectroscopy. The binding energy of Sn3ds/2 for all samples shows the Sn^4＋ bonding state from SnO2. An intensive violet luminescence peak near 395 nm is observed at room temperature due to oxygen vacancies or donor levels formed by Sb^5＋ ions. The film deposited with 20 cc solution shows 70 % transmittance at 550 nm leading to the highest figure of merit （2.11 × 10^-3 Ω^-1）. The resistivity and carrier concentration vary over 1.22 × 10^-3 to 0.89 × 10^-3Ω cm and 5.19 ×10^20 to 8.52 × 10^20 cm^-3, respectively.

关键词： semiconductors microstructure optical properties electrical properties

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