Photonics and Optoelectronics Group

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Dr. Lakshminarayana Polavarapu

Total Publications: 71, Total Citations: 6700
h-index: 46,  i10-index: 63

(Updated: April. 2020)
Google scholar ID | Researcher ID

Spin Polarization Dynamics of Free Charge Carriers in CsPbI3 Nanocrystals
S. Strohmair, A. Dey, Y. Tong, L. Polavarapu, B. J. Bohn, J. Feldmann
Nano Letters (Accepted) (2020)

Transfer of Direct to Indirect Bound Excitons by Electron Intervalley Scattering in Cs2AgBiBr6 Double Perovskite Nanocrystals
A. Dey, A. F. Richter, T. Debnath, H. Huang, L. Polavarapu, J. Feldmann
ACS Nano, 14, 5, 5855–5861 (2020)

Manganese-doping Induced Quantum Confinement within Host Perovskite Nanocrystals through Ruddlesden-Popper Defects

S. Paul, E. Bladt, A. F. Richter, M. Döblinger, Y. Tong, H. Huang, A. Dey, S.Bals, T. Debnath, L. Polavarapu, J. Feldmann
Angew. Chem. Int. Ed. 59 (17), 6794-6799 (2020)

Excitons and narrow bands determine the optical properties of cesium bismuth halides

S. Rieger, B. J. Bohn, M. Döblinger, A. F. Richter, Y. Tong, K. Wang, P. Müller-Buschbaum, L. Polavarapu, L. Leppert, J. K. Stolarczyk, J. Feldmann
Physical Review B, 100, 201404(R) (2019)

Real-time electron and hole transport dynamics in halide perovskite nanowires

L. Janker,Y. Tong, L. Polavarapu, J. Feldmann, A. S. Urban, H. Krenner
Nano Lett., 19, 8701−8707 (2019)

Spontaneous Crystallization of Perovskite Nanocrystals in Nonpolar Organic Solvents: A Versatile Approach for their Shape-controlled Synthesis

H. Huang, Y. Li, Y. Tong, E.-P. Yao, M. Döblinger, M. W. Feil, A. F. Richter, A. L. Rogach, J. Feldmann, and L. Polavarapu
Angew. Chem. Int. Ed., 58, 16558-16562 (2019)

Nanoscale & Nanoscale Advances joint themed collection on halide perovskite nanocrystals (Editorial)

L. Polavarapu, Q. Zhang, R. Krahne
Nanoscale, 11, 8648-8650 (2019)

Identifying and Reducing Interfacial Losses to Enhance Color-pure Electroluminescence in Blue-emitting Perovskite Nanoplatelet Light-emitting Diodes

R. L. Z. Hoye, M.L. Lai, M. Anaya, Y. Tong, K. Galkowski, T. Doherty, W. Li, T. N. Huq, S. Mackowski, L. Polavarapu, J. Feldmann, J. L. MacManus-Driscoll, R. H. Friend, A. S. Urban, and S. D Stranks
ACS Energy Lett. 4, 1181-1188 (2019)

Exciton Diffusion Length and Dissociation Rate in CsPbBr3 Perovskite Nanocrystal-PCBM Composites: Layer-by-Layer vs Blend Structures

E. P. Yao, B. J. Bohn, Y. Tong, H. Huang, L. Polavarapu,* J. Feldmann
Adv. Opt. Mater 7 (8) 1801776 (2019)

Chemical Cutting of Perovskite Nanowires into Single-Photon Emissive Low-aspect Ratio CsPbX3 (X= Cl, Br & I) Nanorods

Y. Tong, M. Fu, E. Bladt, H. Huang, A. F. Richter, K. Wang, P. Müller-Buschbaum, S. Bals, P. Tamarat, B. Lounis, J. Feldmann, L. Polavarapu*
Angew. Chem. Int. Ed. 57 (49), 16094-16098 (2018) (Hot paper)

Accelerated carrier relaxation through reduced Coulomb screening in 2D halide perovskite nanoplatelets

V. A. Hintermayr, L. Polavarapu, A. S. Urban, J. Feldmann
ACS Nano 12 (10), 10151–10158 (2018)

Boosting tunable blue luminescence of halide perovskite nanoplatelets through post-synthetic surface trap repair

B. J. Bohn, Y. Tong, M. Gramlich, M. L. Lai, M. Gramlich, K. Wang, R. L. Z. Hoye, P. M. Buschbaum, S. D. Stranks, A. S. Urban, L. Polavarapu,* J. Feldmann 
Nano letters 18 (8), 5231-5238 (2018)

Spontaneous Self-Assembly of Perovskite Nanocrystals into Electronically Coupled Supercrystals: Toward Filling the Green Gap

Y. Tong, E.-P. Yao, A. Manzi, E. Bladt, K. Wang, M. Doblinger, S. Bals, P. M. Buschbaum, A. S. Urban, L. Polavarapu,* J. Feldmann
Advanced Materials, 30, 1801117 (2018)

Resonantly Enhanced Multiple Exciton Generation through Below-Band-Gap Multi-Photon Absorption in Perovskite Nanocrystals

A. Manzi, Y. Tong, J. Feucht, E.-P. Yao, L. Polavarapu, A. S. Urban, J. Feldmann
Nature Communications 9 (1) 1518 (2018)

Challenges and prospects in solar water splitting and CO2 reduction with inorganic and hybrid nanostructures

J. Stolarczyk, S. Bhattacharyya, L. Polavarapu, J. Feldmann 
ACS Catalysis 8, 3602–3635 (2018)

Dephasing and quantum beating of excitons in methyl ammonium lead iodide perovskite nanoplatelets

B. J. Bohn, T. Simon, M. Gramlich, A. F. Richter, L. Polavarapu, A. S. Urban, J. Feldmann
ACS Photonics 5, 648-654 (2018)

From Precursor Powders-to-CsPbX3 Perovskite Nanowires: One-pot Synthesis, Growth Mechanism and Oriented Self-assemblies
Y. Tong, B. J. Bohn, E. Bladt, K. Wang, P. M. Buschbaum, S. Bals, A. S. Urban, L. Polavarapu,* J. Feldmann
Angewandte Chemie Int.Ed., 56 (44), 13887-13892 (2017)

Advances in quantum-confined perovskite nanocrystals for optoelectronics
L. Polavarapu,* B. Nickel, J. Feldmann, and A. S. Urban
Advanced Energy Materials, 7 (16), 1700267 (2017)

Dilution-Induced Formation of Hybrid Perovskite Nanoplatelets
Y. Tong, F. Ehrat, W. Vanderlinden, C. Cardenas-Daw, J.K. Stolarczyk, L. Polavarapu,* and A. S. Urban
ACS Nano 10 (12), 10936-10944 (2016)

Highly Luminescent Cesium Lead Halide Perovskite Nanocrystals with Tunable Composition and Thickness via Ultrasonication
Y. Tong, E. Bladt, M. F. Aygüler, A. Manzi, K. Z. Milowska, V. A. Hintermayr, P. Docampo, S. Bals, A. S. Urban, L. Polavarapu,* and J. Feldmann
Angewandte Chemie Int.Ed. (44), 13887–13892 (2016)

Tuning the Optical Properties of Perovskite Nanoplatelets through Composition and Thickness by Ligand-assisted Exfoliation
V. A. Hintermayr, A. F. Richter, F. Ehrat, M. Doblinger, W. Vanderlinden, J. A. Sichert, Y. Tong, L. Polavarapu,* A. S. Urban, and J. Feldmann
Advanced Materials 28 (43), 9478-9485 (2016)

Colloidal Lead Halide Perovskite Nanocrystals: Synthesis, Optical Properties and Applications
H. Huang, A. Susha, L. Polavarapu, J. A. Sichert, A. S. Urban,* and A. Rogach*
NPG Asia Materials 8, e328 (2016)

Synthesis, Properties and Optical Applications of Low-dimensional Perovskites
Y. Zhang, J. Liu, Z. Wang, Y. Xue, Q. Ou, L. Polavarapu, J. Zheng, X. Qi, Q. Bao
Chem. Commun. 52, 13637-13655 (2016)

Galvanic replacement coupled to seeded growth as a route for shape controlled synthesis of plasmonic nanorattles
L. Polavarapu,* D. Zanaga, T. Altantzis, S. Rodal-Cedeira, I. pastroiza-Santos, J. Perez-Juste, S. Bals, L.M. Liz-Marzán
J. Am. Chem. Soc. 138, 11453-11456 (2016)

Plasmonic Au@Pd nanorods with boosted refractive index susceptibility and SERS efficiency: A multifunctional platform for hydrogen sensing and monitoring of catalytic reactions
S. Rodal-Cedeira, V. Montes-Garcia, L. Polavarapu, D. M. Solís, H. Heidari, A. La Porta, M. Angiola, A. Martucci, J. M. Taboada, F. Obelleiro, S. Bals, J. Perez-Juste, I. Pastroiza-Santos
Chem. Mater. 28 (24) 9169–9180 (2016)

Encapsulation of single plasmonic nanoparticle within ZIF-8 and its SERS analysis of MOF flexibility
G. Zheng, S. de Marchi, V. López-Puente, K. Sentosun, L. Polavarapu, I. Perez-Juste, E. H. Hill, S. Bals, L.M. Liz-Marzán, I. Pastroiza-Santos, J. Perez-Juste
Small 12 (29), 3935-3943 (2016)

A New Method for Quantitative XEDS Tomography of complex Hetero-Nanostructures
D. Zanaga, T. Altantzis, L. Polavarapu, L.M. Liz-Marzán, B. Freitag, S. Bals
Part. Part. Syst. Charact. 33, 396-403 (2016)

Inorganic Engineered Nanoparticles in Drinking Water Treatment: A critical review
K. Simeonidis, E. Kaprara, S. Mourdikoudis, M. Mitrakas, L. Polavarapu*
Environ. Sci.: Water Res. & Technol. 2, 43-70(2016)

Gold nanooctahedra with tunable size and Microfluidic-Induced 3D assembly for Highly Uniform SERS-active Supercrystals
S. Gómez-Graña, C. Fernández-López, L. Polavarapu, J. Baptiste Salmon, J. Leng, I. Pastoriza-Santos, and J. Perez-Juste
Chem. Mater. 27 (24), 8310–8317(2015)

Palladium Nanoparticle-loaded Cellulose Paper: A Highly Efficient, Robust and Recyclable Self-Assembled Composite Catalytic System
G. Zheng, K. Kaefer, S. Mourdikoudis, L. Polavarapu, Belén Vaz, S. Cartmell, A. Bouleghlimat, N. J. Buurma, L. Yate, Ángel R. de Lera, L.M. Liz-Marzán, I. pastroiza-Santos, J.Perez-Juste
J. Phys. Chem. Lett. 6, 230–238(2015)

Gold Nanoparticle-loaded Filter paper: A Recyclable "Dip-Catalyst" for Real-Time Reaction Monitoring by Surface Enhanced Raman Scattering
G. Zheng, L. Polavarapu, L.M. Liz-Marzán, . pastroiza-Santos, J.Perez-Juste
Chem.Commun. 51, 4572-4575(2015)

Gold Nanorods-pNIPAM hybrids with Reversible Plasmon Coupling: Synthesis, Modeling and SERS properties
C. Fernández-López, L. Polavarapu,* D. M. Solís, J. Manuel Taboada, F. Obelleiro, R. Contreras-Caceres, I. pastroiza-Santos, J.Perez-Juste
ACS Appl. Mater. & interfaces 7, 12530-12538(2015)

Mesoporous SnO2 Coated Metal Nanoparticles with Enhanced Catalytic Efficiency
CNa Zhou, L. Polavarapu, Qing Wang, Qing-Hua Xu
ACS Appl. Mater. & interfaces 7, 4844-4850(2015)

Polyvinylpyrrolidone (PVP) in Nanoparticle Synthesis
K. Koczkur, S. Mourdikoudis, L. Polavarapu,* Sara E. Skrabalak
Dalton Trans. 44, 17883-17905 (2015)

Controlled Preparation of Au/Ag/SnO2 Core-Shell Nanoparticles Using a Photochemical Method and Applications in LSPR based Sensing
Na Zhou, Chen Ye, L. Polavarapu, and Qing-Hua Xu
Nanoscale 7, 9025-9032 (2015)

Nanocrystal Engineering of Metals and Metal Chalcogenides: Controlling Morphology, Crystallinity and Composition
L. Polavarapu,* S. Mourdikoudis, I. pastroiza-Santos and J. Perez-Juste
CrystEngComm. 17, 3727-3762 (2015)

Plasmon-Enhanced Light Harvesting: Applications in Enhanced Photocatalysis, Photodynamic therapy and Photovoltaics
N. Zhou, V. López-Puente,  Q. Wang, L. Polavarapu, I. pastroiza-Santos and Qing-Hua Xu
RSC Advances 5, 29076-29097 (2015)

Flexible, Robust and highly efficient broadband nonlinear optical materials based on graphene oxide impregnated polymer sheets
X,-F Jiang, L. Polavarapu, M. RiZhao, Qing-Hua Xu
Photonics Research 3 (3), A87-A91 (2015)

Monitoring Galvanic Replacement Through Three-mensional Morphological and Chemical Mapping
G. Bart, L. Polavarapu, S. Bals, G. Van Tendeloo, L.M. Liz-Marzán
Nano Lett. 14 (6), 3220–3226 (2014)

Pen-on-paper Approach Toward the Design of Universal Surface Enhanced Raman Scattering Substrates
L. Polavarapu,* A. La Porta, S.M. Novikov, M. Coronado-Puchau, L.M. Liz-Marzán,
Small 40 (15), 3065–3071 (2014)

Reduced Graphene Oxide-Supported Gold Nanostars for Enhanced SERS Sensing and Drug Delivery
Y. Wang, L. Polavarapu, and L.M. Liz-Marzán
ACS Appl. Mater. & interfaces 6 (24), 21798–21805 (2014)

Solution processed polydimethylsiloxane/gold nanostar flexible substrates for plasmonic sensing
A. Shiohara, J. langer, L. Polavarapu, L.M. Liz-Marzán
Nanoscale 6, 9817-9823 (2014)

Optical Sensing of Biological, Chemical and Ionic Species Through Aggregation of Plasmonic Nanoparticles
L. Polavarapu,* J. Perez-Juste, Qing-Hua Xu, L.M. Liz-Marzán
J. Mater. Chem. C 2, 7460 (2014)

Growth and galvanic replacement reaction of Ag nanocubes in organic medium
L. Polavarapu,* L.M. Liz-Marzán
Nanoscale 5, 4355-4361 (2013)

TiO2 coated Au/Ag nanorods with enhanced photocatalytic activity under visible light irradiation
Na Zhou, L. Polavarapu, Nengyue Gao, Yanlin Pan, Peiyan Yuan, Qing Wang, Qing-Hua Xu
Nanoscale 5, 4236-4241(2013)

Size tunable Au@Ag core-shell nanoparticles: Synthesis and SERS properties
A.K.Samal, L. Polavarapu, S-Rodal. I. pastroiza-Santos, J.Perez-Juste, L.M. Liz-Marzán
Langmuir 29, 15076(2013)

Towards low-cost flexible substrates for nanoplasmonic sensing
L. Polavarapu and L.M. Liz-Marzán
Physical Chemistry Chemical Physics 15, 5288-5300 (2013)

Graphene oxide as a tunable broadband nonlinear optical material for femtosecond laser pulses
L. Polavarapu and L.M. Liz-Marzán
J. Phys. Chem. Lett. 3, 785 (2012)

Plasmon Enhanced Photo-catalytic Properties of Cu2O Nanowires-Au Nanoparticles Assembly
Yanlin Pan, SuziDeng, L. Polavarapu, N Gao, P Yuan, X-Q Hua
Langmuir 28, 12304 (2012)

Enhanced Optical Properties of Graphene Oxide – Au Nanocrystal Composites
Y.H. Lee, L. Polavarapu, Nengyue Gao, Peiyan Yuan, Qing-Hua Xu
Langmuir 28, 321 (2012)

Huge enhancement of optical nonlinearities in coupled metal nanoparticles induced by conjugated polymers
L. Polavarapu, V. Mamidala, Z. Guan, W. Ji, Qing-Hua Xu
Appl. Phys. Lett. 100, 023106 (2012)

Preparation of conducting silver films at mild temperatures for organic electronics
L. Polavarapu, Kiran Kumar Manga, Cao Hanh Duyen, Kian Ping Loh, Qing-Hua Xu
Chem. Mater. 23, 3273. (2011)

One-Pot Synthesis of Cu1.94S-CdS and Cu1.94S-ZnxCd1-xS Nanodisk Heterostructures>
M. D. Regulacio, C. Ye, S.H. Lim, M. Bosman, L. Polavarapu, Q.-H. Xu and M.-Y. Han
J. Am. Chem. Soc. 133, 2052 (2011)

Monolayer Graphene as Saturable Absorber in Modelocked Laser>
Qiaoliang Bao, Han Zhang, Zhenhua Ni, Yu Wang, L. Polavarapu, Kian Ping Loh, Zexiang Shen, Qing-Hua Xu, and Ding Yuan Tang
Nanoresearch, 2011, 4, 297 (2011)

One and Two-photon Imaging of Cancer Cells Using Biocompatible Water Soluble Quantum Size Gold Clusters as Fluorescent labels&gt
L. Polavarapu, Manoj Manna, Qing-Hua Xu
Nanoscale 3, 429 (2011)

Alkylamine Capped Metal Nanoparticle “Inks” for Printable SERS Substrates, Electronics and Broadband Photon Detectors
L. Polavarapu, K. Kumar Manga, Y. Kuai, P. Kailian Ang, C. Hanh Duyen, J. Balapanuru, K. Ping Loh, Qing-Hua Xu
Nanoscale 3, 2268 (2011)

Two-photon ratiometric sensing of Hg2+ using cysteine functionalized Ag NPs induced
J. Cuifeng, G. Zhenping, L. Polavarapu, and Qing-Hua Xu
Nanoscale 3, 3316 (2011)

Bimetallic Au/Ag Core-Shell Nanorods Studied by Ultrafast Transient Absorption Spectroscopy under Selective Excitation
Y. Kuai, L Polavarapu, Qing-Hua Xu
J. Phys. Chem. C 115, 14000 (2011)

Rapid Synthesis of Highly Monodisperse AuxAg1-x Alloy Nanoparticles via a Half-Seeding Approach
T. Ting Chng, L. Polavarapu, Qing-Hua Xu, W. Ji, and H. Chun Zeng
Langmuir 27, 5633 (2011)

Excitation Wavelength and Intensity Dependent Femtosecond Transient Absorption Studies on Electron Dynamics of Gold Nanorods
Yu Kuai, You Guanjun, L Polavarapu, Qing-Hua Xu
Langmuir 27, 5633 (2011)

Graphene Oxide-Organic Dye Ionic Complex with DNA Sensing and Optical Limiting Properties
J. Balapanuru, Jia-Xiang Yang, Si Xiao, Qiaoliang Bao, Maryam Jahan, L Polavarapu, Qing- Hua Xu, Ji Wei, Kian Ping Loh
Angew. Chem. Int. Ed. 49, 1 (2010)

Enhanced Two-photon Emission in Coupled Metal nanoparticles Induced by Conjugated Polymers
Z. Guan, L. Polavarapu, and Qing-Hua Xu
Langmuir 26, 18020 (2010)

Transient photoconductivity and femtosecond nonlinear optical properties of a conjugated polymer–graphene oxide composite
V. Nalla, L. Polavarapu, K. Kumar Manga, B. Min Goh, K. Ping Loh, Qing-Hua Xu and W. Ji
Nanotechnology 21, 415203 (2010)

Enhanced Nonlinear Optical response in Donor-Acceptor complexes via Photo induced Electron/Energy Transfer
V. Mamidala, L. Polavarapu*, Wei Ji, and Qing-Hua Xu
Optics express 18, 25928 (2010)

Recent advances in metal enhanced optical studies
COSMOS 6, 167 (2010)

Optical Limiting Properties of Oleylamine Capped Gold Nanoparticles for Both femtosecond and Nanosecond Laser Pulses
L. Polavarapu, N. Venkatram, Wei Ji, and Qing-Hua Xu
ACS Appl. Mater. Interfaces 1 (10) 2298–2303 (2009)

Nonlinear Optical Switching Behavior of Au Nanocubes and Nanooctahedra Investigated by Femtosecond Z-scan Measurements
L. Polavarap, Y.H. Lee, Y.L. Yan, L. Polavarapu, Q.-H. Xu Xu
Appl. Phys. Lett. 95, 023105 (2009)

A Simple Method for Large Scale Synthesis of Highly Monodisperse Gold Nanoparticles at Room Temperature and Their Electron Relaxation Properties
L. Polavarapu and Q.-H. Xu
Nanotechnology 20, 185606 (2009)

Water Soluble Conjugated Polymers Induced Self-Assembly of Gold Nanoparticles and Its Application to SERS
L. Polavarapu and Q.-H. Xu
Langmuir 24, 10608 (2008)

A single-step synthesis of gold nanochains using an amino acid as a capping agent and characterization of their optical properties
L. Polavarapu and Q.-H. Xu
Nanotechnology 19, 075601 (2008)

Optical limiting properties of silver nanoprisms
L. Polavarapu and Q.-H. Xu, M. S. Dhoni and W. Ji
Appl. Phys. Lett. 92, 263110 (2008)