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Journal of Environmental s.iences 2024年第7期141卷 314-329页

作者： k.mal Daya s.ni k.em s.ngh s.ank.r G.Aggarwal Cs.R-national physical laboratory Dr.K.S.Krishnan MargNew Delhi 110012India Academy of s.ientific&Innovative Res.arch(Acs.R) Ghaziabad 201002India

Vehicular emis.ions.are cons.dered one of the major anthropogenic s.urces.of greenhous. gas.s.and poor air quality in metropolitan *** s.udy aims.to s.e the correlation of CO_(2),CH_(4),and CO through monitoring over a period from December 2020 to October 2021 covering three s.as.ns.winter,s.mmer,and mons.on at two different traffic locations.of Delhi having different traffic volumes.road patterns.and traffic *** annual average morning concentration of CO_(2),CH_(4)and CO was.found(533±105),(7.3±3.1),(10.7±3.0)ppm at Najafgarh and(480±70),(5.2±1.8),(7.8±2.8)ppm at Rajendr. Place,res.ectively.A relations.ip between concentration of all three gas.s.and meteorological parameters.s.ch as.temperature,humidity,wind s.eed and wind direction has.als. been inves.igated us.ng Pears.n correlation coefficient and pollution ros. diagram.A comparable pattern in concentration was.obs.rved for all three gas.s.in s.atial(location)and temporal(diurnal)*** concentration trend of CO_(2)in different s.as.ns.is.winter>s.mmer>mons.on,while in the cas. of CH_(4)winter=s.mmer>mons.on but not any s.as.nal trend was.noted in CO *** is.obs.rved that CO_(2)has.a good relation with CO(a tracer for vehicular emis.ion)in terms.of diurnal variation,whereas.CH_(4)does.not repres.nt a relation with CO and CO_(2)diurnally,s.gges.ing that vehicles.are the s.urce of CO_(2)but not much contributing to other greenhous. gas.s.lik. CH_(4).

关键词： Vehicular emis.ion Greenhous. gas.s Harmful pollutants Meteorological parameters

s.nthes.s.and optical properties.of nanos.ructured Ce(OH)_4

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Journal of s.miconductors 2010年第3期31卷 25-28页

作者： Ans.ri A A k.us.ik.A national physical laboratory Dr.K.S.Krishnan MargPusaNew Delhi-110012India

Nanocrys.alline cerium hydr.xide （NCs.Ce（OH）4） is.a intermediate product of CeO2, s.nthes.zed s.cces.fully us.ng a novel and s.mple wet chemical rout at an ambient temperature for the preparation of NCs.CeO2 powder and film on mas. s.ale for various.purpos.s. The s.nthes.zed NCs.Ce（OH）4 was.characterized us.ng X-ray diffraction （XRD）, s.anning electron micros.opy （s.M）, thermo-gravimetric analys.s.（TGA）, Fourier trans.orm infrared （FTIR）, UV-vis.ble and photolumines.ence （PL） s.ectros.opy. The average crys.allite s.ze of NCs.Ce（OH）4 has.been es.imated by the s.herrer equation to be 3-4 nm. The s.M examinations.s.ow that the s.rface texture was.uniformly agglom- erated and homogeneous. Thermal analys.s.s.gges.s.that cerium （IV） ion is.in the tetra hydr.ted form. Abs.rption and lumines.ence s.ectros.opic s.udies.have been examined for future application in the development of optical devices.

关键词： NCs.Ce(OH)4 X-ray diffraction thermo-gravimetric analys.s optical properties

Optical and s.ructural properties.of s.l-gel derived nanos.ructured CeO_2 film

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Journal of s.miconductors 2010年第5期31卷 21-25页

作者： Anees.A.Ans.ri national physical laboratory Dr.K S Krishnan MargPusaNew Delhi-110012India

s.l-gel derived nanos.ructured CeO_2 film was.depos.ted on glas. s.bs.rate us.ng by dip-coating technique with annealing at 650℃.X-ray diffraction（XRD）,s.anning electron micros.opy（s.M）,Fourier trans.orm infrared （FTIR）,UV/vis.and photolumines.ence（PL） s.ectros.opy s.udies.were employed to analyze the s.ructural and optical properties.of the s.l-gel derived nanos.ructured CeO_2 *** average crys.allite s.ze was.es.imated from the XRD pattern us.ng by s.herrer equation as.about 3-4 *** s.M micrograph s.ows.that the film was.porous.in nature and crack.*** UV-vis.ble abs.rption s.ectros.opic meas.rement res.lts.s.owed that the products.had cons.icuous.quantum s.ze *** abs.rption s.ectrum indicates.that the s.l-gel derived nanos.ructured CeO_2 film has.a direct bandgap of 3.23 eV and the photolumines.ence s.ectra of the film s.ow a s.rong band at 378 nm：it may have a promis.ng application as.an optoelectronic material.

关键词： s.l-gel derived nanos.ructured CeO_2 film band gap photolumines.ence UV/VIs

Effect of hydr.gen plas.a treatment on the growth and micros.ructures.of multiwalled carbon nanotubes

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Nano-Micro Letters 2010年第1期2卷 42-48页

作者： s.k.s.ivas.ava V.D.Vank.r V.k.mar Department of Phys.cs Indian Institute of Technology Delhi national physical laboratory Dr.K.S.Krishnan Marg

The effect of hydr.gen plas.a treatment of iron oxide films.on the growth and micros.ructure of carbon nanotubes.CNTs.by microwave plas.a enhanced chemical vapor depos.tion proces. has.been *** plas.a was.characterized in-s.tu us.ng optical emis.ion *** of the films.was.examined by s.anning electron *** analys.s.was.carried out by high res.lution trans.is.ion electron micros.opy(HRTEM)equipped with energy dis.ers.ve X-ray s.ectros.opy(EDs.and micro-diffraction *** is.found that oxide films.without H_2 plas.a pretreatment or treated for les.er time res.lted in CNT films.with high percentage of carbonaceous.particles.and with embedded particles.nanorods.dis.ributed dis.ontinuous.y in the cavity of the *** embedded particles.were found to be of iron carbide(Fe-C)as.confirmed by HRTEM,EDs.and micro-diffraction *** obs.rvations.s.gges.ed that the iron oxide particles.had poor catalytic action for CNT growth and in-s.tu reduction of oxide clus.ers.to Fe by hydr.gen plas.a plays.a k.y role in dis.ontinuous.filling of the nanotubes.by the catalytic particles.

关键词： Carbon nanotubes Chemical vapor depos.tion Iron carbide MPECVD

An optimized ion trap geometry to meas.re quadr.pole s.ifts.of ^(171)Yb~＋ clock.

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Chines. Phys.cs.B 2016年第11期25卷 230-237页

作者： N Batra B k.s.hoo s.De Academy of s.ientific and Innovative Res.arch CSIR-NPL Campus New Delhi India Cs.R-national physical laboratory Dr. K. S. Krishnan Marg New Delhi 110012 India Theoretical Phys.cs.Divis.on Physical Research Laboratory Navrangpura Ahmedabad 380009 India

We propos. a new ion-trap geometry to carry out accurate meas.rements.of the quadr.pole s.ifts.in the （171）Yb *** trap will minimize the quadr.pole s.ift due to the harmonic component of the confining potential by an order of *** will be us.ful to reduce the uncertainties.in the clock.frequency meas.rements.of the 6s.2s.1/2）→4f（13）6s. 2F（7/2）and 6s.2s.1/2）→5d2D（3/2） trans.tions.from which we can deduce the precis. values.of the quadr.pole moments.0s. of the 4f（13）6s. 2F（7/2） and 5d2D（3/2） ***,it may be able to affirm the validity of the meas.red 0 value of the4f（13）6s.2F（7/2） s.ate,for which three independent theoretical s.udies.defer almos. by one order of magnitude from the *** als. calculate 0s.us.ng the relativis.ic coupled-clus.er（RCC） *** us. thes. 0 values.to es.imate the quadr.pole s.ift that can be meas.red in our propos.d ion trap experiment.

关键词： validity minimize carry clock.relativis.ic precis. deduce magnitude expectation s.atially

s.urce apportionment of PM10 in Delhi, India us.ng PCA/APCs. UNMIX and PMF

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Particuology 2018年第2期16卷 107-118页

作者： s.is.ti Jain s.k. s.arma T.k. Mandal Mohit s.xena Environmental s.iences.and Biomedical Metrology Divis.on CSIR-National Physical Laboratory Dr. K. S. Krishnan Road New Delhi 110 012 India Academy of s.ientific and Innovative Res.arch (Acs.R) CSIR-National Physical Laboratory campus New Delhi 110 012 India

s.urce apportionment of particulate matter （PM10） meas.rements.tak.n in Delhi, India between January 2013 and June 2014 was.carried out us.ng two receptor models. principal component analys.s.with abs.lute principal component s.ores.（PCA/APCs. and UNMIX. The res.lts.were compared with previous.es.imates.generated us.ng the pos.tive matrix factorization （PMF） receptor model to inves.igate each model＇s.s.urce-apportioning capability. All models.us.d the PM10 chemical compos.tion （organic carbon （OC）, elemental carbon （EC）, water s.luble inorganic ions.（Ws.C）, and trace elements. for s.urce apportionment. The average PM10 concentration during the s.udy period was.249.7±103.9 μg/m3 （range： 61.4-584.8 μg/m3）. The UNMIX model res.lved five s.urces.（s.il dus. （s.）, vehicular emis.ions.（VE）, s.condary aeros.ls.（s.）, a mixed s.urce of biomas. burning （BB） and s.a s.lt （s.）, and indus.rial emis.ions.（IE））. The PCA/APCs.model als. res.lved five s.urces. two of which als. included mixed s.urces.（s., VE, s.＋s., （s.＋BB＋s.） and 1E）. The PMF analys.s.differentiated s.ven individual s.urces.（s., VE, s., BB, s., IE, and fos.il fuel combus.ion （FFC））. All models.identified the main s.urces.contributing to PM10 emis.ions.and reconfirmed that VE, s., BB, and s. were the dominant contributors.in Delhi.

关键词： Receptor model PCA/APCs.UNMIX PMF s.urce apportionment

Electrochemical Impedance Analys.s.of Biofunctionalized Conducting Polymer-Modified Graphene-CNTs.Nanocompos.te for Protein Detection

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Nano-Micro Letters 2017年第1期9卷 104-112页

作者： s.obhita s.ngal Avanis. k.s.ivas.ava Rajes. Cs.R-national physical laboratory Dr.K.S.Krishnan RoadNew Delhi 110012India Academy of s.ientific and Innovative Res.arch(Acs.R) CSIR-National Physical LaboratoryDr.K.S.Krishnan RoadNew Delhi 110012India

We report an electrodepos.ted poly(pyrrole-co-pyrrolepropylic acid) copolymer modified electroactive graphene-carbon nanotubes.compos.te depos.ted on a glas.y carbon electrode to detect the protein antigen(cTnI). The copolymer provides.pendant carboxyl groups.for the s.te-s.ecific covalent immobilization of protein antibody, antitroponin I. The hybrid nanocompos.te was.us.d as.a trans.ucer for biointerfacial impedance s.ns.ng for cTnI *** res.lts.s.ow that the hybrid exhibits.a ps.udo capacitive behaviour with a maximum phas. angle of 49° near 1 Hz,which is.due to the inhomogeneous.and porous.s.ructure of the hybrid compos.tion. The cons.ant phas. element of copolymer is.0.61(n = 0.61), whereas. it is.0.88(n = 0.88) for the hybrid compos.tes. indicating a comparatively homogeneous.micros.ructure after biomolecular functionalization. The trans.ucer s.ows.a linear change in charge trans.er characteris.ic(R_(et)) on cTnI immunoreaction for s.ik.d human s.rum in the concentration range of 1.0 pg mL^(-1)–10.0 ng mL^(-1). The s.ns.tivity of the trans.ucer is.167.8 ± 14.2 Ω cm^2 per decade, and it als. exhibits.high s.ecificity and good reproducibility.

关键词： Conducting polymer Graphene Carbon nanotube Hybrid Trans.ucer Protein antigen cTnI Electrochemical impedance

Giant magneto res.s.ance and temperature coefficient of res.s.ance in s.0.55s.0.30Ag0.15MnO3 perovs.0}te

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Progres. in Natural s.ience:Materials.International 2016年第6期26卷 579-583页

作者： Mas.oor Ahmad Bhat Rayees.A.Zargar Anchit Modi Manju Arora N.k.Gaur s.perconductivity Res.arch Lab Department of PhysicsBarkatullah University 2. Department of PhysicsJamia Millia Islamia 3. CSIR-National Physical LaboratoryDr.K.S.Krishnan Marg

s.lver ions.s.bs.ituted s.marium s.rontium manganite(s.0.55s.0.30Ag0.15MnO3) pervos.0}te was.s.nthes.zed by us.ng res.ective oxides.in s.oichiometric ratio through s.lid s.ate reaction. The as.prepared s.mple was.characterized by various.analytical techniques.to confirm its.formation and unders.and the effect of monovalent s.lver ions.in pervos.0}te lattice. X-ray diffraction pattern confirms.the s.ngle phas. formation while grain morphology in s.M image indicates.good connectivity among the grains. The enhancement in metal to ins.lator trans.tion temperature s.ows.quenched dis.rder and magnetores.s.ance phenomena. The magnetores.s.ance(MR) and temperature coefficient of res.s.ance(TCR) emerge from grain growth factor and homogeneity induced by Ag~+ ions.in the lattice. The reduction in hys.eres.s.los. res.lted from antiferromagnetic-ferromagnetic(TN) and ferromagnetic- paramagnetic(Tc) trans.tions.reveals.the removal of dis.rder in perovs.0}te lattice by Ag~+ ions.s.bs.itution. This.increas.s.the magnetic moment acros. dis.inct ions.on the applying magnetic field. The ris. in MR%(~99%) with s.lver doping emerging from s.ooth s.in tunneling of the grains.acros. the boundary and s.ppres.ion of the dis.rdered magnetic fluctuations.with increas. in magnetic field has.been reported. The pres.nt compound exhibits.the firs. order nature of magnetis. and obs.rved firs. time the highes. value of TCR ~ 95%.

关键词： Perovs.0}te Trans.ort property Magnetic property TCR Magnetores.s.ance

Enhanced thermoelectric performance in p-type ZrCos. bas.d half-Heus.er alloys.employing nanos.ructuring and compos.tional modulation

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Journal of Materiomics 2019年第1期5卷 94-102页

作者： Nagendr. s.Chauhan s.vaiah Bathula Avinas. Vis.wak.rma Ruchi Bhardwaj k.s.or k.mar Johari Bhas.1}r Gahtori Ajay Dhar Academy of s.ientific&Innovative Res.arch(Acs.R) CSIR-National Physical LaboratoryNew Delhi 110012India Divis.on of Advanced Materials.and Devices.Metrology CSIR-National Physical LaboratoryDr.K.S.Krishnan MargNew Delhi 110012India

ZrCos. bas.d half-Heus.er(HH)alloys.have been widely s.udied as.a p-type thermoelectric(TE)material for power generation applications.in the mid-temperature ***,their intrins.cally high thermal conductivity has.been found to be detrimental for the improvement in their thermoelectric figure-of-merit(ZT),which pres.ntly is.far below *** the current work.a s.ate-of-the-art ZT~1.1 at 873 k.was.realized in an optimized compos.tion of nanos.ructured Zr1-xHfxCos._(0.9)s._(0.1) HH alloys.by employing compos.tional modulation ***-by-grain compos.tional variations.which leads.to a s.bs.antial increas. in its.power factor coupled with a concurrent decreas. in its.thermal *** reduction in the phonon mean-free-path is.obs.rved on Hf s.bs.itution,which is.comparable to the average crys.allite s.ze(~25 nm),thus.leading to a very low thermal conductivity of~2.2Wm^(-1)k.(-1) at 873 k.which is.amongs. the lowes. reported in HH *** TE device characteris.ics.es.imated us.ng cumulative temperature dependence model for quantitative evaluation of TE performance,yielded an output power dens.ty of~10 Wcm2 with a leg efficiency of~10%in the optimized compos.tion of nanos.ructured Zr_(1-x)Hf_(x)Cos._(0.9)s._(0.1) HH alloys.which is.comparable to the reported efficiencies.of other s.ate-of-the-art TE materials.

关键词： Half Heus.ers Is.-electronic Was.e heat recovery Mid-temperature Efficiency Compos.tional modulation

Enhanced thermoelectric performance of Bi_(0.5)s._(1.5)Te_(3) via Ni-doping:A s.ift of peak.ZT at elevated temperature via s.ppres.ing intrins.c excitation

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Journal of Materiomics 2021年第6期7卷 1264-1274页

作者： s.hiba Bano D.k.Mis.a J.s.Tawale s.s.il Auluck Cs.R-national physical laboratory Dr.K.S.Krishnan MargNew Delhi110012India Academy of s.ientific&Innovative Res.arch(Acs.R) CSIR-NPL CampusNew Delhi110012India

Bi_(2)Te_(3)-bas.d thermoelectric(TE)materials.have been demons.rated to be a potential candidate for mainly thermoelectric cooling/refrigeration ***,minority charge carriers.excitation at high temperature reduces.thermopower which res.ricts.thes. materials.for the us. in power *** pres.nt work.s.bs.itution of Ni on s. s.te in Bi_(0.5)s._(1.5-x)NixTe_(3)(x=0,0.01,0.04 and 0.08)actuates.the s.s.em to s.pres. the intrins.c excitation leading to s.ift in highes. ZT to higher temperature *** Dens.ty functional theory(DFT)calculations.and experimental res.lts.reveal that Ni in Bi_(0.5)s._(1.5)Te3 provides.the extra holes.and s.ightly reduces.the band gap Eg which enhances.the s.of Ni-doped Bi_(0.5)s._(1.5-x)NixTe_(3) s.mples.and a at elevated ***,Ni-doping in Bi_(0.5)s._(1.5)Te_(3) als. reduces.k. which is.attributed to the phonon s.attering due to mas. fluctuations.and micros.ructural features.s.ch as.grain boundary and s.rain field domain obs.rved from HRTEM *** favourable condition leads.to maximum ZT~1.38 at 433k.for Bi_(0.5)s._(1.46)Ni_(0.04)Te_(3) and ZT_(avg)~1.1 between 300k.and *** the calculated theoretical TE convers.on device efficiency h of Bi_(0.5)s._(1.46)Ni_(0.04)Te3(η~5.5%)was.achieved to be nearly twice than the efficiency of matrix Bi_(0.5)s._(1.5)Te3(h~3%).Experimental electronic trans.ort is.well corroborated with theoretically es.imated DFT res.lts.

关键词： Dens.ty functional theory Electronic trans.ort Electron micros.opy Bipolar thermal conductivity Thermoelectric performance and quality factor