2023
Correlated photocurrent and fluorescence imaging from individual Graphene oxide nanosheet
Yamaguchi H, Galande C, Yalcin S, Ajayan P, Doorn S, Mohite A. Correlated photocurrent and fluorescence imaging from individual Graphene oxide nanosheet. 2023, 350-350. DOI: 10.11470/jsapmeeting.2013.2.0_350.Peer-Reviewed Original Research
2022
Microbial biofilms as living photoconductors due to ultrafast electron transfer in cytochrome OmcS nanowires
Neu J, Shipps CC, Guberman-Pfeffer MJ, Shen C, Srikanth V, Spies JA, Kirchhofer ND, Yalcin SE, Brudvig GW, Batista VS, Malvankar NS. Microbial biofilms as living photoconductors due to ultrafast electron transfer in cytochrome OmcS nanowires. Nature Communications 2022, 13: 5150. PMID: 36071037, PMCID: PMC9452534, DOI: 10.1038/s41467-022-32659-5.Peer-Reviewed Original ResearchConceptsUltrafast electron transferElectron transferPhotoconductive atomic force microscopyFemtosecond transient absorption spectroscopyQuantum dynamics simulationsMicrobial electron transferAtomic force microscopyTransient absorption spectroscopyValue-added chemicalsIndividual nanowiresWhole-cell catalysisPhotoconductive materialForce microscopyCarrier densityCatalytic performanceNanowiresAbsorption spectroscopyPhotoactive proteinsEfficient productionPhotoconductorsSynthetic photosensitizersDynamics simulationsGeobacter sulfurreducensBiodegradable materialsElectronic interfaceA 300-fold conductivity increase in microbial cytochrome nanowires due to temperature-induced restructuring of hydrogen bonding networks
Dahl PJ, Yi SM, Gu Y, Acharya A, Shipps C, Neu J, O’Brien J, Morzan UN, Chaudhuri S, Guberman-Pfeffer MJ, Vu D, Yalcin SE, Batista VS, Malvankar NS. A 300-fold conductivity increase in microbial cytochrome nanowires due to temperature-induced restructuring of hydrogen bonding networks. Science Advances 2022, 8: eabm7193. PMID: 35544567, PMCID: PMC9094664, DOI: 10.1126/sciadv.abm7193.Peer-Reviewed Original ResearchTemperature-sensitive switchNanowires exhibitNanowiresSynthetic molecular wireTemperature-induced restructuringRaman spectroscopyRational engineeringCarrier lossRespiratory electronsExtracellular respirationSystematic tuningMicrometersMolecular wiresNetworkConductivity increasesNanometersLong-range conductionElectronsEngineeringSpectroscopyReduction potentialTuningProtein nanowires with tunable functionality and programmable self-assembly using sequence-controlled synthesis
Shapiro DM, Mandava G, Yalcin SE, Arranz-Gibert P, Dahl PJ, Shipps C, Gu Y, Srikanth V, Salazar-Morales AI, O’Brien J, Vanderschuren K, Vu D, Batista VS, Malvankar NS, Isaacs FJ. Protein nanowires with tunable functionality and programmable self-assembly using sequence-controlled synthesis. Nature Communications 2022, 13: 829. PMID: 35149672, PMCID: PMC8837800, DOI: 10.1038/s41467-022-28206-x.Peer-Reviewed Original ResearchConceptsProtein nanowiresElectronic functionalityChemical-based synthesisConductive protein nanowiresSequence-controlled synthesisHigh electronic conductivityGold nanoparticlesSite-specific conjugationSynthetic chemistryTunable functionalityElectronic conductivityTunable propertiesAttractive biomaterialNonstandard amino acidsSynthetic biologyNanowiresBiomaterialsProtein materialSynthesisAtomic structureMost biomaterialsIncorporation of tryptophanFunctionalityConductivityNanoparticles
2021
Structure of Geobacter pili reveals secretory rather than nanowire behaviour
Gu Y, Srikanth V, Salazar-Morales AI, Jain R, O’Brien J, Yi SM, Soni RK, Samatey FA, Yalcin SE, Malvankar NS. Structure of Geobacter pili reveals secretory rather than nanowire behaviour. Nature 2021, 597: 430-434. PMID: 34471289, PMCID: PMC9127704, DOI: 10.1038/s41586-021-03857-w.Peer-Reviewed Original ResearchConceptsExtracellular electron transferType 4 piliElectron transferProtein nanowiresCryo-electron microscopyNanowiresNanowire behaviorGeobacter piliC-terminal residuesTranslocation machineryAssembly architectureLoss of secretionMajor phylaGeobacter speciesPrevious structural analysisSurface appendagesGeobacter sulfurreducensAromatic side chainsPiliPilAΠ stackingWidespread effectsBioelectronicsMicroorganismsFilamentsRoadmap on emerging concepts in the physical biology of bacterial biofilms: from surface sensing to community formation
Wong GCL, Antani JD, Lele PP, Chen J, Nan B, Kühn MJ, Persat A, Bru JL, Høyland-Kroghsbo NM, Siryaporn A, Conrad JC, Carrara F, Yawata Y, Stocker R, Brun Y, Whitfield GB, Lee CK, de Anda J, Schmidt WC, Golestanian R, O’Toole G, Floyd KA, Yildiz FH, Yang S, Jin F, Toyofuku M, Eberl L, Nomura N, Zacharoff LA, El-Naggar MY, Yalcin SE, Malvankar NS, Rojas-Andrade MD, Hochbaum AI, Yan J, Stone HA, Wingreen NS, Bassler BL, Wu Y, Xu H, Drescher K, Dunkel J. Roadmap on emerging concepts in the physical biology of bacterial biofilms: from surface sensing to community formation. Physical Biology 2021, 18: 10.1088/1478-3975/abdc0e. PMID: 33462162, PMCID: PMC8506656, DOI: 10.1088/1478-3975/abdc0e.Peer-Reviewed Original ResearchConceptsBacterial biofilmsPhysiology of microbesBiofilm microbiologyCommunities of bacteriaSingle-cell behaviorWork of physicistsAtomic physicsRecent important discoveriesNew physicsMatter physicsCellular organizationPhysical biologyPhysicsBiofilmsBiologyPhysicistsSurprising behaviorEnergy flowImportant discoveriesIntense attentionDivision of laborMicrobesMicrobiologyCommunity behaviorOpposite strategy
2020
The blind men and the filament: Understanding structures and functions of microbial nanowires
Yalcin SE, Malvankar NS. The blind men and the filament: Understanding structures and functions of microbial nanowires. Current Opinion In Chemical Biology 2020, 59: 193-201. PMID: 33070100, PMCID: PMC7736336, DOI: 10.1016/j.cbpa.2020.08.004.Peer-Reviewed Original ResearchConceptsMicrobial nanowiresExtracellular electron transferDifferent nanowiresNanowiresPotential applicationsCryo-electron microscopyTransport electronsMultimodal functional imagingElectron transferBioelectronicsImportant environmental processesRecent discoveryPhysiological studiesOMCApplicationsMicroscopyBiofuelsSensingPhysiological needsMicrometersCrucial roleUnderstanding structureDirect evidenceThousands of papersEnergy productionElectric field stimulates production of highly conductive microbial OmcZ nanowires
Yalcin SE, O’Brien J, Gu Y, Reiss K, Yi SM, Jain R, Srikanth V, Dahl PJ, Huynh W, Vu D, Acharya A, Chaudhuri S, Varga T, Batista VS, Malvankar NS. Electric field stimulates production of highly conductive microbial OmcZ nanowires. Nature Chemical Biology 2020, 16: 1136-1142. PMID: 32807967, PMCID: PMC7502555, DOI: 10.1038/s41589-020-0623-9.Peer-Reviewed Original ResearchConceptsConductive protein nanowiresIndividual nanowiresProtein nanowiresElectronic functionalityNanowiresElectric fieldGeobacter sulfurreducens biofilmsHigh conductivityMost natural materialsHigh stiffnessElectrical signalsBidirectional interfaceElectronic systemsLiving materialsNatural materialsΠ stackingSpectroscopic studiesEnergy productionNanospectroscopyConductivityStiffnessConformational switchingΒ-sheetHeme groupSensingDirect observation of anisotropic growth of water films on minerals driven by defects and surface tension
Yalcin SE, Legg BA, Yeşilbaş M, Malvankar NS, Boily JF. Direct observation of anisotropic growth of water films on minerals driven by defects and surface tension. Science Advances 2020, 6: eaaz9708. PMID: 32832658, PMCID: PMC7439304, DOI: 10.1126/sciadv.aaz9708.Peer-Reviewed Original ResearchMineral nanoparticlesWater filmAmplitude-modulated atomic force microscopyAtomic force microscopyFilm surface energySmooth film surfaceNanoscale topographyForce microscopySurface tensionWater vaporNanoparticlesMolecular simulationsAnisotropic growthHigh surface tensionSurface energyFilm surfaceThick filmsInhomogeneous thicknessThick meniscusFilm growthFilmsWater layerIce nucleationAtmospheric processesElement cyclingProbing the Role of Metal Coordination and pH in Assembly and Function of Cytochrome Nanowires
Srikanth V, Gu Y, O'Brien J, Jain R, Yalcin S, Yi S, Samatey F, Malvankar N. Probing the Role of Metal Coordination and pH in Assembly and Function of Cytochrome Nanowires. Biophysical Journal 2020, 118: 335a-336a. DOI: 10.1016/j.bpj.2019.11.1872.Peer-Reviewed Original Research
2019
Structure of Microbial Nanowires Reveals Stacked Hemes that Transport Electrons over Micrometers
Wang F, Gu Y, O’Brien J, Yi SM, Yalcin SE, Srikanth V, Shen C, Vu D, Ing NL, Hochbaum AI, Egelman EH, Malvankar NS. Structure of Microbial Nanowires Reveals Stacked Hemes that Transport Electrons over Micrometers. Cell 2019, 177: 361-369.e10. PMID: 30951668, PMCID: PMC6720112, DOI: 10.1016/j.cell.2019.03.029.Peer-Reviewed Original Research
2016
Femtosecond Dynamics of Nanoscale Molecular Heterogeneity
Atkin J, Pollard B, Metzger B, Sass P, Yalcin S, Lea A, Teichen P, Eaves J, Raschke M. Femtosecond Dynamics of Nanoscale Molecular Heterogeneity. 2016, uw1a.3. DOI: 10.1364/up.2016.uw1a.3.Peer-Reviewed Original Research
2015
Photoluminescence imaging of solitary dopant sites in covalently doped single-wall carbon nanotubes
Hartmann NF, Yalcin SE, Adamska L, Hároz EH, Ma X, Tretiak S, Htoon H, Doorn SK. Photoluminescence imaging of solitary dopant sites in covalently doped single-wall carbon nanotubes. Nanoscale 2015, 7: 20521-20530. PMID: 26586162, DOI: 10.1039/c5nr06343d.Peer-Reviewed Original Research(Invited) Photoluminescence Carrier Dynamics and Photon Statistics of Covalent Dopant-Induced Trap States in Single Wall Carbon Nanotubes
Doorn S, Ma X, Hartmann N, Yalcin S, Htoon H. (Invited) Photoluminescence Carrier Dynamics and Photon Statistics of Covalent Dopant-Induced Trap States in Single Wall Carbon Nanotubes. ECS Meeting Abstracts 2015, MA2015-01: 803-803. DOI: 10.1149/ma2015-01/6/803.Peer-Reviewed Original ResearchDopant sitesEmitting statesNanowire single-photon detectorsRoom temperature photonQuantum information processingNovel photon sourcesSingle-photon detectorsImportance of excitonsSingle-photon emittersNon-radiative decay pathwaysLocalization of excitonsPhotoluminescence quantum yieldPhotoluminescence decay dynamicsPhoton correlation studiesSingle-tube levelPhoton sourcesLow-temperature studiesPhoton statisticsCarrier dynamicsPhoton emittersDecay dynamicsExciton mobilityPhotoluminescence lifetimePhotoluminescence studiesElectronic structureDynamic and Steady State Optical Studies of Individual Covalent Dopant Sites in Single-Wall Carbon Nanotubes
Hartmann N, Yalcin S, Haroz E, Ma X, Htoon H, Doorn S. Dynamic and Steady State Optical Studies of Individual Covalent Dopant Sites in Single-Wall Carbon Nanotubes. ECS Meeting Abstracts 2015, MA2015-01: 805-805. DOI: 10.1149/ma2015-01/6/805.Peer-Reviewed Original ResearchSingle-wall carbon nanotubesDopant sitesCarbon nanotubesUse of SWCNTsLight-harvesting systemsWall carbon nanotubesPhotoluminescence quantum yieldAssociated functional groupsType of dopantCovalent functionalizationNon-radiative decay channelsFunctional groupsChem.Electronic structureLow-temperature studiesQuantum yieldChemical propertiesEfficient emittersEmitting statesLong PL lifetimeOptical propertiesLong single-wall carbon nanotubesDynamic optical propertiesSingle-tube levelEmission intensityBench-top aqueous two-phase extraction of isolated individual single-walled carbon nanotubes
Subbaiyan N, Parra-Vasquez A, Cambré S, Cordoba M, Yalcin S, Hamilton C, Mack N, Blackburn J, Doorn S, Duque J. Bench-top aqueous two-phase extraction of isolated individual single-walled carbon nanotubes. Nano Research 2015, 8: 1755-1769. DOI: 10.1007/s12274-014-0680-z.Peer-Reviewed Original ResearchSingle-walled carbon nanotubesCarbon nanotubesIndividual single-walled carbon nanotubesPristine single-walled carbon nanotubesHigh-performance devicesTransmission electron microscopyIsolated single-walled carbon nanotubesBench-top approachNanotube researchHigh-end instrumentationSWCNT materialAtomic forceElectron microscopyTwo-phase extractionAqueous dispersionsDefect densityNanotubesTwo-phase separationHigh purityFluorescence imagingThermogravimetric analysisFundamental studiesApplicationsATP methodDispersionDirect Imaging of Charge Transport in Progressively Reduced Graphene Oxide Using Electrostatic Force Microscopy
Yalcin SE, Galande C, Kappera R, Yamaguchi H, Martinez U, Velizhanin KA, Doorn SK, Dattelbaum AM, Chhowalla M, Ajayan PM, Gupta G, Mohite AD. Direct Imaging of Charge Transport in Progressively Reduced Graphene Oxide Using Electrostatic Force Microscopy. ACS Nano 2015, 9: 2981-2988. PMID: 25668323, DOI: 10.1021/nn507150q.Peer-Reviewed Original ResearchElectrostatic force microscopyGraphene oxideOptical propertiesDirect imagingThin-film optoelectronic applicationsForce microscopyEFM measurementsOptoelectronic propertiesCharge transportDevelopment of GOQuantum chemistry calculationsOptical spectroscopyGood electrical conductivityOptoelectronic devicesOptoelectronic applicationsFlexible thin filmsPhotoluminescence imagingChemistry calculationsThin filmsPhase transitionTheoretical modelingMultifunctional materialsPotential barrierBulk quantitiesCharge propagation
2014
Visualization of charge propagation along individual pili proteins using ambient electrostatic force microscopy
Malvankar NS, Yalcin SE, Tuominen MT, Lovley DR. Visualization of charge propagation along individual pili proteins using ambient electrostatic force microscopy. Nature Nanotechnology 2014, 9: 1012-1017. PMID: 25326694, DOI: 10.1038/nnano.2014.236.Peer-Reviewed Original ResearchElectronic Structure and Chemical Nature of Oxygen Dopant States in Carbon Nanotubes
Ma X, Adamska L, Yamaguchi H, Yalcin SE, Tretiak S, Doorn SK, Htoon H. Electronic Structure and Chemical Nature of Oxygen Dopant States in Carbon Nanotubes. ACS Nano 2014, 8: 10782-10789. PMID: 25265272, DOI: 10.1021/nn504553y.Peer-Reviewed Original ResearchSingle-walled carbon nanotubesCarbon nanotubesOxygen-doped single-walled carbon nanotubesEmission peakElectronic structure simulationsLocal dielectric environmentChemical adductsDeep trap statesChemical natureAsymmetric emission peaksElectronic structureE11 excitonNanotubesOxygen dopingSingle nanotubePhotoluminescence studiesDopant statesDielectric environmentTemperature photoluminescence studiesAdductsTrap statesStructure simulationsBright exciton peakSpectral featuresEnergy splittingMetallic 1T phase source/drain electrodes for field effect transistors from chemical vapor deposited MoS2
Kappera R, Voiry D, Yalcin S, Jen W, Acerce M, Torrel S, Branch B, Lei S, Chen W, Najmaei S, Lou J, Ajayan P, Gupta G, Mohite A, Chhowalla M. Metallic 1T phase source/drain electrodes for field effect transistors from chemical vapor deposited MoS2. APL Materials 2014, 2: 092516. DOI: 10.1063/1.4896077.Peer-Reviewed Original ResearchSource/drain electrodesContact resistanceDrain electrodesLow contact resistanceLarge contact resistancePerformance of devicesDimensional transition metal dichalcogenidesField-effect transistorsGood mobility valuesTransition metal dichalcogenidesDirect band gapHigh resistance contactsResistance contactsDevice propertiesEffect transistorsFET performanceChemical vaporElectronic materialsBulk materialPhase transformationResistance electrodesElectrodeMetal dichalcogenidesBand gapT phase