Parameswar K. Iyer


January 2013: Professor, Department of Chemistry,  Indian Institute of Technology-Guwahati, Assam. INDIA

 

April 2008-January 2013: Associate Professor, Department of Chemistry,  Indian Institute of Technology-Guwahati, Assam. INDIA

 

July-2004-March 2008: Assistant Professor, Department of Chemistry,  Indian Institute of Technology-Guwahati, Assam. INDIA

Dec. 2003-June 2004: Department of Macromolecular Science & Engineering, Case Western Reserve University, Cleveland, Ohio, USA

September 2001-November 2003: Institute of Polymers & Organic solids and Department. of Chemistry, University of California, Santa Barbara, California, USA

September 1999-September 2001:Department of Chemistry, Technion, Israel Institute of Technology, Haifa, ISRAEL

September 1995-September 1999: Ph.D. Silicates and Catalysis Division, Central Salt & Marine Chemicals Research Institute, Bhavnagar, Gujarat, INDIA


Research Group Webpage-----Group Members----Research Areas----Laboratory News----Photo Album


Contact details:

Department of Chemistry
Indian Institute of Technology Guwahati
Guwahati-781039, Assam. INDIA
Tel: +91-361-258-2314 (O)
Fax: +91-361-269-0762 / 258-2349
E-mail: pki@iitg.ernet.in

 


Selected Publications:

TOTAL CITATIONS ~2600, H-index 28 (Google Scholar)

 

1.    Tanwar, A. S.; Iyer, P. K.* Fluorescence ″Turn-On″ indicator displacement assay based sensing of nitroexplosive 2,4,6-trinitrophenol in aqueous media via a polyelectrolyte and dye complex. (Revision) (2017), 2, XXXX-XXXX.

 

2.    Bhim Raju, T.; Vaghasiya, J. V.; Afroz, M. A.; Soni, S. S.;* Iyer, P. K.* Twisted donor substituted simple thiophene dyes retard the dye aggregation and charge recombination in dye-sensitized solar cells. (Revision) (2017), 2, XXXX-XXXX.

 

3.    Meher, N.; Iyer, P. K.* Pendant chain engineering to fine-tune the nanomorphologies and solid state luminescence of naphthalimide AIEEgens: application to phenolic nitro-explosive detection in water. Nanoscale (2017), 9 (22), 7674-7685.

 

4.    Singh, A.; Dey, A.; Das, D.; Iyer, P. K.* Combined Influence of Plasmonic Metal Nanoparticle and Dual Cathode Buffer Layer for Highly Efficient rrP3HT:PCBM Based Bulk Heterojunction Solar Cell. J. Mater. Chem. C, (2017), 5, DOI: 10.1039/c7tc01621b

 

5.    Sahu, T. K.; Arora, S.; Banik, A.; Iyer, P. K.; Qureshi, M.* Efficient and Rapid Removal of Environmental Malignant Arsenic(III) and Industrial Dyes Using Re-usable, Recoverable Ternary Iron Oxide-ORMOSIL-Graphene Oxide Composite. ACS Sust. Chem. Eng. (2017), 5, DOI: 10.1021/acssuschemeng.7b00632

 

6.    Vasimalla, S.; Subbarao, N. V. V.; Gedda, M.; Goswami, D. K.; Iyer, P. K.* Effects of Dielectric Material, HMDS Layer, and Channel Length on the Performance of the Perylenediimide-Based Organic Field-Effect Transistors. ACS Omega, (2017), 2, 2552-2560.

 

7.    Muthuraj, B.; Mukherjee, S.; Chowdhury, S. R.; Patra, C.;* Iyer, P. K.* An Efficient Strategy to Assemble Water Soluble Histidine-Perylene Diimide and Graphene Oxide for the Detection of PPi in Physiological conditions and in vitro. Biosen. Bioelect. (2017), 89, 636-644. DOI:10.1016/j.bios.2015.12.036. (This work is highlighted in Atlas of Science)

 

8.    Dey, A.; Singh, A.; Das, D.; Iyer, P. K.* High Performance ZnPc Thin Film based Photo-Sensitive Organic Field Effect Transistors: Influence of Multilayer Dielectric Systems and Thin Film Growth Structure. ACS Omega, (2017), 2, 1241-1248. DOI: 10.1021/acsomega.7b00094

 

9.    Malik, A. H.; Iyer, P. K.* Conjugated Polyelectrolyte Based Sensitive Detection and Removal of Antibiotics Tetracycline from Water. ACS Appl. Mater. Interfaces, (2017), 9, 4433-4439.

 

10. Das, D.; Gopikrishna, P.; Singh, A.; Dey, A.; Iyer, P. K.* Solution Processed WPLEDs with Good Color Stability and High Color Rendering Index via a Phosphor-Sensitized System. ChemistrySelect, (2017), 2, 3184-3190. DOI: 10.1002/slct.201700254.

 

11. Gupta, R. K.; Das, D.; Gupta, M.; Pal, S. K.; Iyer, P. K.;* Achalkumar, A. S.* Electroluminescent room temperature columnar liquid crystals based on bay-annulated perylene tetraesters. J. Mater. Chem. C, (2017), 5, 1767-1781.

 

12. Sharma, B.; Singh, A.; Afroz, M. A.; Iyer, P. K.;* Jacob, J.* Direct arylation polymerization approach for the synthesis of narrow band gap cyclopentadithiophene based conjugated polymer and its application in solar cell devices. Syn. Met., (2017), 226, 56-61.

 

13. Das, D.; Gopikrishna, P.; Narasimhan, R.; Singh, A.; Dey, A.; Iyer, P. K.* White Polymer Light Emitting Diodes based on PVK: Effect of Electron Injection Barrier on Transport Property, Electroluminescence and Controlling the Electroplex Formation. Phys. Chem. Chem. Phys., (2016), 18, 33077-33084. DOI: 10.1039/C6CP07092B

 

14. Muthuraj, B.; Mukherjee, S.; Patra, C.;* Iyer, P. K.* Amplified Fluorescence from Polyfluorene Nanoparticles with Aggregation-Induced Enhanced Emission for Live Cell Imaging and Cancer Theranostics. ACS Appl. Mater. Interfaces (2016), 8, 32220-32229. DOI: 10.1021/acsami.6b11373

 

15. Dey, A.; Singh, A.; Das, D.; Iyer, P. K.* Photosensitive Organic Field Effect Transistor: Influence of ZnPc Morphologyand Bilayer Dielectrics to Achieve Low Operating Voltage and Low Bias Stress Effect. Phys. Chem. Chem. Phys., (2016), 18, 32602-32609. DOI: 10.1039/ C6CP06481G

 

16. Bhim Raju, T.; Vaghasiya, J. V.; Afroz, M. A.; Soni, S. S. and Iyer, P. K.* Influence of m-fluorine Substituted Phenylene Spacer Dyes in Dye-sensitized Solar Cells. Org. Elect., (2016), 39, 371-379. DOI: 10.1016/j.orgel.2016.10.024.

 

17. Bhim Raju, T.; Vaghasiya, J. V.; Afroz, M. A.; Soni, S. S. and Iyer, P. K.* Design, synthesis and DSSC performance of o-fluorine substituted phenylene spacer sensitizers: Effect of TiO2 thickness variation. Phys. Chem. Chem. Phys., (2016), 18, 28485-28491. DOI: 10.1039/c6cp05641e

 

18. Gopikrishna, P.; Iyer, P. K.* Mono-Substituted Dibenzofulvene-based Luminogens: Aggregation-Induced Emission Enhancement and Dual-State Emission. J. Phys. Chem. C, (2016), 120, 26556-26568. DOI: 10.1021/acs.jpcc.6b09689

 

19. Kalita, A.; Hussain, S.; Malik, A. H.; Barman, U.; Goswami, N.; Iyer, P. K.* Anion exchange induced strong π-π interactions in single crystalline naphthalene diimide for nitroexplosive sensing: An electronic prototype for visual on-site detection. ACS Appl. Mater. Interfaces, (2016), 8(38), 25326-25336. DOI: 10.1021/acsami.6b08751.

 

20. Meher, N.; Chowdhury, S. R.; Iyer, P. K.* Aggregation Induced Emission Enhancement and Growth of Naphthalimide Nanoribbons via J-Aggregation: Insight into Disaggregation Induced Unfolding and Detection of Ferritin at Nanomolar Level. J. Mater. Chem. B, (2016), 4, 6023-6031. DOI: 10.1039/C6TB01746K.

 

21. Hussain, S.; Malik, A. H.; Iyer, P. K.* FRET-assisted selective detection of flavins via cationic conjugated polyelectrolyte under physiological conditions. J. Mater. Chem. B, (2016), 4, 4439-4446. DOI: 10.1039/C6TB01350C

 

22. Vasimalla, S.; Subbarao, N. V. V.; Iyer, P. K.* Low voltage, low cost, flexible and balanced ambipolar OFETs based on Br2PTCDI-C18/CuPc fabricated on an Al foil gate substrate with good ambient stability. J. Mater. Chem. C, (2016), 4, 7102-7109. DOI: 10.1039/C6TC02315K.

 

23. Tanwar, A. S.; Hussain, S.; Malik, A. H.; Afroz, M. A.; Iyer, P. K.* Inner Filter Effect Based Selective Detection of Nitroexplosive-Picric Acid in Aqueous Solution and Solid Support Using Conjugated Polymer. ACS Sens., (2016), 1, 1070-1077. DOI: 10.1021/acssensors.6b00441.

 

24. Chowdhury, S. R.; Agarwal, M.; Meher, N.; Muthuraj, B.; Iyer, P. K.* Modulation of Amyloid Aggregates into Nontoxic Coaggregates by Hydroxyquinoline Appended Polyfluorene. ACS Appl. Mater. Interfaces, (2016), 8, 13309-13319. DOI: 10.1021/acsami.6b03668

 

25. Malik, A. H.; Hussain, S.; Iyer, P. K.* Aggregation-Induced FRET via Polymer-Surfactant Complexation: A New Strategy for the Detection of Spermine. Anal. Chem. (2016), 88, 7358-7364. DOI: 10.1021/acs.analchem.6b01788

 

26. Singh, A.; Dey, A.; Das, D.; Iyer, P. K.* Effect of Dual Cathode Buffer Layer on the Charge Carrier Dynamics of rrP3HT:PCBM Based Bulk Heterojunction Solar Cell. ACS Appl. Mater. Interfaces (2016), 8(17), 10904-10910. DOI: 10.1021/acsami.6b03102.

 

27. Das, D.; Gopikrishna, P.; Singh, A.; Dey, A.; Iyer, P. K.* Influence of emissive layer thickness on electrical characteristics of polyfluorene copolymer based polymer light emitting diodes. Journal of Physics (2016), 704, 012016.

 

28. Dey, A.; Singh, A.; Kalita, A.; Das, D.; Iyer, P. K.* High Performance, Low Operating Voltage n-Type Organic Field Effect Transistor Based on Inorganic-Organic Bilayer Dielectric System. Journal of Physics (2016), 704, 012017.

 

29. Kalita, A.; Dey, A.; Iyer, P. K.* Effect of inorganic/organic dual dielectric layer on the morphology and performance of n-channel OFETs. Phys. Chem. Chem. Phys., (2016), 18, 12163-12168. DOI: 10.1039/C6CP01087C.

 

30. Das, D.; Gopikrishna, P.; Singh, A.; Dey, A.; Iyer, P. K.* Efficient blue and white polymer light emitting diodes based on a well charge balanced, core modified polyfluorene derivative. Phys. Chem. Chem. Phys., (2016), 18(3), 7389-7394.

 

31. Subbarao, N. V. V.; Gedda, M.; Iyer, P. K.* Goswami, D. K.* Organic Field-Effect Transistors as High Performance Humidity Sensors with Rapid Response, Recovery Time and Remarkable Ambient Stability. Org. Elect., (2016), 17(32), 169-178.

 

32. Ravibabu, V.; Hussain, S. Iyer, P. K.; Pugazhenthi, G.;* Katiyar, V.* Non-isothermal crystallization kinetics of sucrose palmitate reinforced poly(lactic acid) bionanocomposites. Polym. Bull., (2016), 71(1), 21-38. DOI 10.1007/s00289-015-1468-3.

 

33. Malik, A.; Hussain, S.; Kalita, A.; Iyer, P. K.* Conjugated polymer nanoparticles for the amplified detection of nitro-explosive picric acid on multiple platforms. ACS Appl. Mater. Interfaces (2015), 7, 26968-26976. DOI: 10.1021/acsami.5b08068.

 

34. Kalita, A.; Hussain, S.; Malik, A. H.; Subbarao, N. V. V.; Iyer, P. K.* Vapor phase sensing of ammonia at sub-ppm level using perylene diimide thin film device. J. Mater. Chem. C, (2015), 3, 10767-10774. DOI:10.1039/C5TC02521D.

 

35. Soni, S. S.;* Fadadu, K. B.; Vaghasiya, J. V.; Solanki, B. G.; Sonigara, K. K. Singh, A.; Das, D.; Iyer, P. K.* Improved Molecular Architecture of D-π-A Carbazole Dyes: 9% PCE with Cobalt Redox Shuttle in Dye Sensitized Solar Cells. J. Mater. Chem. A, (2015), 3, 21664-21671. DOI: 10.1039/C5TA06548H.

 

36. Muthuraj, B.; Layek, S.; Trivedi, V.;* Iyer, P. K.* Multiple Function Fluorescein Probe Performs Metal Chelation, Disaggregation and Modulation of Aggregated and -Cu Complex. ACS Chemical Neuroscience, (2015), 6, 1880-1891. DOI: 10.1021/acschemneuro.5b00205.

 

37. Muthuraj, B.; Chowdhury, S. R.; Iyer, P. K.* Modulation of Amyloid-β Fibrils into Mature Micro Rod-shaped Structure by Histidine Functionalized Water-soluble Perylene Diimide. ACS Appl. Mater. Interfaces (2015), 7(38), 21226-21234. DOI: 10.1021/acsami.5b07260.

 

38. Gopikrishna, P.; Das, D.; and Iyer, P. K.* Synthesis and characterization of color tunable, highly electroluminescent copolymers of polyfluorene by incorporating the N-phenyl-1,8-naphthalimide moiety into the main chain. J. Mater. Chem. C, (2015), 3, 9318-9326.

 

39. Ravibabu, V.; Hussain, S. Iyer, P. K.; Pugazhenthi, G.;* Katiyar, V.* Influence of graphene on thermal degradation and crystallization kinetics behaviour of poly(lactic acid). J. Polym. Res. (2015), DOI: 10.1007/s10965-015-0823-2.

 

40. Dar, A. A.; Hussain, S.; Dutta, D.; Iyer, P. K.;* Khan, A.T.* One-pot synthesis of functionalized 4-hydroxy-3-thiomethylcoumarins: Detection and discrimination of Co2+ and Ni2+ ions. RSC Advances, (2015), 5, 57749-57756.

 

41. Malik, A. H.; Hussain, S.; Tanwar, A.; Layek, S.; Trivedi, V.;* Iyer, P. K.* Anionic conjugated polymer as a multi-action sensor for the sensitive detection of Cu2+, PPi, real-time ALP assaying and cell imaging. Analyst, (2015), 140(13), 4388-4392.

 

42. Kalita, A.; Subbarao, N. V. V.; Iyer, P. K.* Large-Scale Molecular Packing and Morphology Dependent High Performance Organic Field-Effect Transistor by Symmetrical Naphthalene-Diimide Appended with Methyl Cyclohexane. J. Phys. Chem. C, (2015), 119(22), 12772-12779.

 

43. Hussain, S.; Malik, A. H.; Afroz, A. M.; Iyer, P. K.* Ultrasensitive Detection of Nitro Explosive-Picric Acid via Conjugated Polyelectrolyte in Aqueous Media and Solid Support. Chemical Communications (2015), 7207-7210.

 

44. Hussain, S.; Malik, A. H., Iyer, P. K.* Highly Precise Detection, Discrimination, and Removal of Anionic Surfactants over the Full pH Range via Cationic Conjugated Polymer: An Efficient Strategy to Facilitate Illicit-Drug Analysis. ACS Appl. Mater. Interfaces (2015), 7, 3189-3198.

 

45. Goutam, P. J.; Iyer, P. K. Selective detection of resorcinol using abis(benzothiazol-2-yl)pyridine based ditopic receptor. Sensors and Actuators B (2015) 211, 263-267.

 

46. Subbarao, N.V.V.; Gedda, M.; Iyer, P. K.;* Goswami, D. K.* Enhanced environmental stability induced by effective polarization of a polar dielectric layer in a trilayer dielectric system of organic field-effect transistors: A quantitative study. ACS Appl. Mater. Interfaces (2015), 7, 1915-1924.

 

47. Muthuraj, B.; Chowdhury, S. R.; Mukherjee, S.; Patra, C.;* Iyer, P. K.* Aggregation Deaggregation Influenced Ultrasensitive detection of Cu2+ and ATP by Histidine Functionalized Water-Soluble Fluorescent Perylene Diimide under Physiological Conditions and in Living Cells. RSC Advances, (2015), 5, 28211 - 28218.

 

48. Dey, A.; Kalita, A.; Iyer, P. K.* High performance n-channel organic thin film transistor based on naphthalene diimide. ACS Appl. Mater. Interfaces (2014), 6, 12295-12301.

 

49. Vasimalla, S.; Senanayak, S.; Sharma, M.; Narayan, K. S.;* Iyer, P. K.*Improved Performance of Solution-Processed n-Type Organic Field-Effect Transistors by Regulating the Intermolecular Interactions and Crystalline Domains on Macroscopic Scale. Chem. Mater. (2014), 26, 4030-4037.

 

50. Gedda, M.; Subbarao, N. V. V.; Vasimalla, S.; Iyer, P. K.;* Goswami, D. K.* Effect of thickness of bi-layer dielectric on 1,7-Dibromo-N,N′-Dioctadecyl-3,4,9,10-perylenetetracarboxylic diimide based organic field-effect transistors. Physica Status Solidi A: Applications and Materials Science (2014), 1-9, DOI 10.1002/pssa.201431304.

 

51. Chetia, B.; Iyer, P. K.* Selective fluoride anion sensing by simple benzimidazolyl based ligand. Sensors and Actuators B (2014), Sensors and Actuators B (2014), 201, 191-195.

 

52. Muthuraj, B.; Deshmukh, R.; Trivedi, V.;* Iyer, P. K.* Highly Selective Probe Detects Cu2+ and Endogenous NO Gas in Living Cell. ACS Appl. Mater. Interfaces (2014), 6(9), 6562-6569.

 

53. Ratha, R.; Goutam, P. J.; Iyer, P. K.* Photo Stability Enhancement of Poly(3-hexylthiophene)-PCBM Nanocomposites By Addition of Multi Walled Carbon Nanotubes Under Ambient Conditions. Org. Elect., (2014), 15(7), 1650-1656.

 

54.   Dar, A. A.; Ali, S.; Ghosh, A.; Khan, A. T.; Dwivedi, A. K.; Iyer, P. K. Synthesis of unsymmetrical sulfides catalyzed by n-tetrabutyl-ammonium tribromide: A selective fluorescence probe for mercury ion. Sensors and Actuators B (2014), 193, 509-514.

 

55.   Dwivedi, A. K.; Iyer, P. K. Therapeutic Strategies to Prevent Alzheimer Disease Pathogenesis Using Fluorescent Conjugated Polyelectrolyte. Macromolecular Bioscience (2014) 14, 508-514. (Chosen to appear as VIP paper) (This work is highlighted in Materials Views)

 

56. Muthuraj, B.; Hussain, S.; Iyer, P. K. From Metalloprotein Binding to Homeostasis: Structural Modification of Amyloid b fibrils and Toxic Metal Removal Using Fluorescent Conjugated Polymer. Polymer Chemistry (2013), 4, 5096-5107. Polymer Chemistry-(Author of the week) and (Paper of the week)

 

57. Dwivedi, A. K.; Iyer, P. K. A Fluorescence Turn on Trypsin Assay Based on Aqueous Polyfluorene. J. Mater. Chem. B (2013), 1, 4005-4010.

 

58. Dwivedi, A. K.; Iyer, P. K. Sensitive Detection of Acid Phosphatase Enzyme and Screening of Inhibitors Using Anionic Polyfluorene Derivatives. Anal. Methods, (2013), 5(9), 2374-2378.

 

59. Hussain, S.; De, S.; Iyer, P. K. Thiazole-Containing Conjugated Polymer as a Visual and Fluorometric Sensor for Iodide and Mercury. ACS Appl. Mater. Interfaces (2013), 5, 2234-2240.

 

60. Chetia, B.; Goutam, P. J.; Chipem, F.; Iyer, P. K. Thiourea recognition by 2,6-bis(2-benzimidazolyl) pyridine. Insights from spectroscopic techniques and DFT. J. Mol. Structure, (2013), 1042, 32-36.

 

61. Dwivedi, A. K.; Prasad, K. M. N.; Trivedi, V.; Iyer, P. K. Interaction of heme proteins with anionic polyfluorene: Insights into physiological effects, folding events and inhibition activity. ACS Appl. Mater. Interfaces (2012), 4, 6371-6377. (Selected by Global Medical Discovery as article of special interest to the drug development sector)

 

62. Saikia, G.; Dwivedi, A. K.; Iyer, P. K. Development of Solution, Film and Membrane Based Fluorescent Sensor for the Detection of Fluoride Anions from Water. Anal. Methods, (2012), 4, 3180-3186. (Selected as Hot Article in Third Quarter of 2012)

 

63. Singh, D. K.; Iyer, P. K.; Giri, P. K. Role of molecular interactions and structural defects in the efficient fluorescence quenching by Carbon Nanotubes. Carbon (2012), 50, 4495-4505.

 

64. Goutam, P. J.; Singh, D. K.; Iyer, P. K. Nature of Photoluminescence quenching of Poly(3-hexylthiophene by Carbon nanotubes. J. Phys. Chem. C, (2012), 116(14), 8196-8201.

 

65. Singh, D. K.; Iyer, P. K.; Giri, P. K. Distinguishing Defect Induced Intermediate Frequency Modes from Combination Modes in Raman Spectrum of Single Walled Carbon Nanotubes. J. Appl. Phys., (2012), 111(6), 064304/1-064304/10.

 

66. Saikia, G.; Iyer, P. K. A remarkable superquenching and superdequenching sensor for the selective and non-invasive detection of inorganic phosphates in saliva. Macromolecules, (2011), 44, 3753-3758.

 

67. Goutam, P. J.; Singh, D. K.; Giri, P. K.; Iyer, P. K. Enhancing the Photostability of Poly(3-hexylthiophene) by Preparing Composites with Multiwalled Carbon Nanotubes. J. Phys. Chem. B, (2011), 115, 919-924.

 

68. Dwivedi, A. K.; Saikia, G.; Iyer, P. K. Aqueous polyfluorene probe for the detection and estimation of Fe3+ and inorganic phosphate in blood serum. J. Mater. Chem., (2011), 21, 2502-2507. (Appeared as Journal Inside Cover Picture)

 

69. Saikia, G.; Murugadoss, A.; Sarmah, P. J.; Chattopadhyay, A.; Iyer, P. K. Tuning the Optical Characteristics of Poly(p-phenylenevinylene) by in Situ Au Nanoparticle Generation. J. Phys. Chem. B (2010), 114(46), 14821-14826.

 

70. Saikia, G.; Iyer, P. K. Facile C-H Alkylation in Water: Enabling Defect-Free Materials for Optoelectronic Devices. J. Org. Chem. (2010), 75(8), 2714-2717.

 

71. Chetia, B.; Iyer, P. K. 2,6-Bis(2-benzimidazolyl) pyridine receptors for urea recognition. Tetrahedron Lett. (2006) 47(46), 8115-8117.

 

72. Knapton, D.; Iyer P. K.; Rowan, S. J.; Weder, C. Synthesis and Properties of Metallo-Supramolecular Poly(p-xylylene)s. Macromolecules, (2006), 39, 4069-4075.

 

73. Ma, W.; Iyer, P. K.; Gong, X.; Liu, B.; Moses, D.; Bazan, G. C.; Heeger, A. J.; Water/Methanol soluble conjugated copolymer as electron-transport layer in polymer light emitting diodes. Advanced Materials (2005), 17(3), 274-277.

 

74. Iyer P. K.; Beck, J. B.; Weder, C.; Rowan, S. J. Synthesis and optical properties of metallo-supramolecular polymers. Chemical Communication, (2005), 3, 319-321.

 

75. Gong, X.; Iyer, P. K.; Moses, D.; Xiao, S. S.; Bazan, G. C.; Heeger, A. J. Stabilized Blue Emission from Polyfluorene-based Light Emitting Diodes: Elimination of Fluorenone Defects. Advanced Functional Materials, (2003), 4(13), 325-330.

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