Publications

75- Deneme, I., Liman, G., Can, A., Demirel, G*., Usta, H., “Enabling Three-Dimensional Porous Architectures via Carbonyl Functionalization: Towards Molecular Specific Organic-SERS Platforms”, NATURE COMMUNICATIONS, 12, 6119, (2021).

74- Liman, G., Yildiz, E., Ilhan, H., Cetin, A. E., Demirel, G., "Hot‐Spot Engineering Through Soft Actuators for Surface‐Enhanced Raman Spectroscopy (SERS) Applications"ADVANCED OPTICAL MATERIALS, 9, 2100009, (2021). 

73- Ergene, E., Liman, G., Yildiz, E., Huri, P. Y., Demirel, G., "Folding Control of Hydrogel Platforms through Pattern Design and Light Illumination", ACS APPLIED POLYMER MATERIALS, 3, 3272-3277, (2021).

72- Cimen, Z., Babadag, S., Odabas, S., Altuntas, S., Demirel, G., Demirel, G.B., "Injectable and Self-Healable pH-Responsive Gelatin–PEG/Laponite Hybrid Hydrogels as Long-Acting Implants for Local Cancer Treatment", ACS APPLIED POLYMER MATERIALS, 3, 3504-3518, (2021).

71- Sahibbeyli, V., Yildiz, D. B., Papir, G., Dede, Y., Demirel, G., "The Role of Molecular Structure of Phenylalanine Peptides on the Formation of Vertically-Aligned Ordered Bionanostructures: Implications for Sensing Application"ACS APPLIED NANO MATERIALS, 3, 4305-4313, (2020). 

70- Yilmaz, M., Demirel, G. B., Demirel, G., "Silver thin film deposited 3-dimensional gold nanorod arrays for plasmonic catalysis", JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A, 38, 2023407, (2020).

69- Demirel, G., Gieseking, R. L. M., Ozdemir, R., Kahmann, S., Loi, M. A., Schatz, G. C., Facchetti, A., Usta, H., "Molecular Engineering of Organic Semiconductors Enables Noble Metal-Comparable SERS Enhancement and Sensitivity", NATURE COMMUNICATIONS, 10, 1-9, (2019). 

68- Usta, H., Kim, D., Ozdemir, R., Zorlu, Y., Kim, S., Delgado, R. M. C., Harbuzaru, A., Kim. S., Demirel, G., Hong, J., Ha, Y. G., Cho, K., Facchetti, A., Kim, M. G., "High Electron Mobility in [1] Benzothieno [3, 2-b][1] benzothiophene (BTBT)-Based Field-Effect Transistors: Toward N-Type BTBTs"CHEMISTRY OF MATERIALS, 31, 5254-5263, (2019). 

67- Ocal, S. K., Pekdemir, S., Serhatlioglu, M., Ipekci, H. H., Sahmetlioglu, E., Narin, I., Duman, F., Elbuken, C., Demirel, G., Onses, M. S., "Eco-friendly fabrication of plasmonically active substrates based on end-grafted poly (ethylene glycol) layers", ACS SUSTAINABLE CHEMISTRY & ENGINEERING, 7, 4315-4324, (2019). 

66- Demirel, G., Usta, H., Yilmaz, M., Celik, M., Alidagi, H. A., Buyukserin, F., "Surface-Enhanced Raman Spectroscopy: An adventure from plasmonic metals to organic semiconductors as SERS platforms"JOURNAL OF  MATERIALS CHEMISTRY C, 6, 5314-5335, (2018).

65- Belu, A., Yilmaz, M., Neumann, E., Offenhausser, A., Demirel, G., Mayer, D., "Asymmetric, nano‐textured surfaces influence neuron viability and polarity"JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART A, 106, 1634-1645, (2018).

64- Yilmaz, M., Babur, E., Ozdemir, M., Gieseking, R. L., Dede, Y., Tamer, U., Schatz, G. C., Facchetti, A., Usta, H., Demirel, G., "Nanostructured Organic Semiconductor Films For Molecular Detection with Surface-Enhanced Raman Spectroscopy", NATURE MATERIALS, 16, 918-925, (2017).

63- Sakir, M., Pekdemir, S., Karatay, A., Kucukoz, B., Ipekci, H. H., Elmali, A., Demirel, G., Onses, M. S. "Fabrication of Plasmonically Active Substrates Using Engineered Silver Nanostructures For SERS Applications", ACS APPLIED MATERIALS & INTERFACES, 9, 39795-39803, (2017).

62- Yilmaz, M., Erkartal, M., Ozdemir, M., Sen, U., Usta, H., Demirel, G., “Three-Dimensional Au-Coated Electrosprayed Nanostructured BODIPY Films on Aluminum Foil as Surface-Enhanced Raman Scattering Platforms and Their Catalytic Applications”, ACS APPLIED MATERIALS & INTERFACES, 9, 18199-18206, (2017).

61- Yavuz, M.S., Citir, M., Cavusoglu, H., Demirel, G., “Measuring Temperature Change at Nanometer Scale on Gold Nanoparticles using Thermoresponsive PEGMA Polymers”, CHEMNANOMAT, 3, 496-502, (2017).

60-  Bakirci, G., Yilmaz M., Babur, E., Ozden, D., Demirel, G., "Understanding the Effect of Polydopamine Coating on Catalytic Reduction Reactions", CATALYSIS COMMUNICATIONS, 91, 48-52, (2016).

59- Erdogan, H., Yilmaz, M., Babur, E., Duman, M., Aydin, H. M., Demirel, G., "Fabrication of Plasmonic Nanorod-Embedded Dipeptide Microspheres via the Freeze Quenching Method for Near-Infrared Laser-Triggered Drug-Delivery Applications", BIOMACROMOLECULES, 17, 1788-1794,  (2016).

58- Yilmaz, M., Bakirci, G., Erdogan, H., Tamer, U., Demirel, G., "The Fabrication of Plasmonic Nanoparticle-Containing Multilayer Films via a Bio-inspired Polydopamine Coating", RSC ADVANCES, 6, 12638-12641, (2016).

57- Esmekaya, M. A.,, Senturk, F., Kahan, H., Tuysuz, M. Z., Tomruk, A., Aral, B. S., Demirel, G., Akın,  N., Ozturk, M. K., Ozcelik, S., Canseven, A. G., Seyhan, N., “Cytotoxicity of Iron Oxide (Fe3O4) Nanoparticles with/without Microwave Radiation Exposure in RG2 Glioblastoma Cells”, JOURNAL OF NANOMATERIALS & MOLECULAR NANOTECHNOLOGY, 5:1, (2016).

56- Yilmaz, M., Ozdemir, M., Erdogan, H., Tamer, U., Sen, U., Facchetti, A., Usta, H., Demirel, G., "Micro-/Nanostructured Highly Crystalline Organic Semiconductor Films for Surface-Enhanced Raman Spectroscopy Applications", ADVANCED FUNCTIONAL MATERIALS, 25, 5669-5676, (2015).

55- Yilmaz, M., Kuloglu, H. B., Erdogan, H., Cetin, S. S., Yavuz, M. S., Ince, G. O., Demirel, G., "Light-Driven Unidirectional Liquid Motion on Anistropic Gold Nanorod Arrays", ADVANCED MATERIALS INTERFACES, 2, 1-5, (2015).

54- Erdogan, H., Babur, E., Yilmaz, M., Candas, E., Gordesel, M., Dede, Y., Oren, E. E., Demirel, G. B., Ozturk, M. K., Yavuz, M. S., Demirel, G., “Morphological Versatility in Self-assembly of Val-Ala and Ala-Val Dipeptides”, LANGMUIR, 31, 7337-7345, (2015).

53- Akin, M. S., Yilmaz, M., Babur, E., Ozdemir, B., Erdogan, H., Tamer, U., Demirel, G., "Large Area Uniform Deposition of Silver Nanoparticles Through Bio-inspired Polydopamine Coating on Silicon Nanowire Arrays for Practical SERS Applications", JOURNAL OF MATERIAL CHEMISTRY B, 2, 4894-4900, (2014).

52- Demirel, G., Babur, E. "Vapor-Phase Deposition of Polymers as a Simple and Versatile technique to Generate Paper-Based Microfluidic Platforms for Bioassay Applications", ANALYST, 139, 2236-2331, (2014).

51- Yilmaz, M., Senlik, E., Biskin, E., Yavuz, M. S., Tamer, U., Demirel, G. "Combining 3-D Plasmonic Gold Nanorod Arrays with Colloidal Nanoparticles as a Versatile Concept for Reliable, Sensitive, and Selective Molecular Detection by SERS", PHYSICAL CHEMISTRY CHEMICAL PHYSICS (PCCP), 16, 5563-5570, (2014).

50- Kubus, L., Erdogan, H., Cetin, S.S., Piskin, E., Demirel G. "Plasmon Enhanced Photocatalysis on Anisotropic Gold Nanorod Arrays", CHEMCATCHEM, 5, 2973-2977, (2013).

49- Ince, G.O., Armagan, E.; Erdogan, H., Buyukserin, F., Uzun, L., Demirel, G. "One-Dimensional Surface-Imprinted Polymeric Nanotubes for Specific Biorecognation by Initiated Chemical Vapor Deposition (iCVD)", ACS APPLIED MATERIALS & INTERFACES,5, 6647-6652, (2013).

48- Erdogan, H., Sakalak, H., Yavuz, M.S., Demirel G. " Laser-Triggered Degelation Control of Gold Nanoparticle Embedded Peptide Organogels", LANGMUIR, 29, 6975-6982, (2013).

47- Yılmaz, F., Kose, K., Sarı, M.M., Uzun, L, Denizli, A., Demirel, G. “Bioinspired surface modification of poly(2-hydroxyethyl methacrylate) based microbeads via oxidative polymerization of dopamine”, COLLOIDS AND SURFACES B: BIOINTERFACES, 109, 176-182, (2013).

46- Kubus, L., Erdogan, H., Piskin, E., Demirel, G. "Controlling Uni-directional Wetting via Surface Chemistry and Morphology", SOFT MATTER, 8, 11704-11707, (2012).

45- Sahin, F., Turan, E., Tumturk, H., Demirel, G. "Core-Shell Magnetic Nanoparticles: A Comparative Study Based on Silica and Polydopamine Coating for Magnetic Bio-separation Platforms", ANALYST, 137, 5654-5658, (2012).

44- Demirel, G., Tamer, U. "Isotropic and anisotropic peptide films based on gas phase deposition", NANOTECHNOLOGY, 23, 225604, (2012).

43- Demirel, G.B., Buyukserin, F., Morris, M.A., Demirel, G. "Nanoporous polymeric nanofibers based on selectively etched PS-b-PDMS block copolymers for pulsative drug release applications", ACS APPLIED MATERIALS&INTERFACES, 4, 280-285, (2012).

42- Çelikbıçak O., Demirel G., Pişkin E., Salih B. “Small Molecule Analysis using Laser Desorption Ionization Mass Spectrometry on Nano-Coated Silicon with Self-Assembled Monolayers”, ANALYTICA CHEMICA ACTA, 729, 54-61, (2012).

41- Demirel G., Buyukserin F., "Surface-induced self-assembly of dipeptides onto nanotextured surfaces", LANGMUIR, 27, 12533-12538, (2011).

40- Celen B., Ekiz D., Piskin E., Demirel G. "Green Catalysts Based on Bio-inspired Polymer Coating and Electroless Plating of Silver Nanoparticles", JOURNAL OF MOLECULAR CATALYSIS A: CHEMICAL,  350, 97-102, (2011).

39- Christophis C., Sekeroglu K., Demirel G., Thome I., Grunze M., Demirel M.C., Rosenhahn A. "Fibroblast adhesion on unidirectional polymeric nanofilms", BIOINTERPHASES, (2011), 6, 158-163.

38- Celen B., Demirel G., Piskin E., "Micro- vs. Nano-Array Platforms: A comparative study for DNA Detection Based on SPR", (2011), NANOTECHNOLOGY, 22, 165501.

37- Garipcan B., Odabas S., Demirel G., Burger J., Nonnenmann S.S., Coster T.M., Gallo M.E., Nabet B., Spanier J.E., Piskin E., “In vitro Biocompatibility of n-type and Undoped Silicon Nanowires”, (2011), ADVANCED BIOMATERIALS, 13, B3-B9.

36- O'Driscoll S., Demirel G., Farell R.A., Fitzgerald T.G., O'Mahony C., Holmes J., Morris M.A., "The morphology and structure of PS-b-P4VP block copolymer films by solvent annealing: effect of the solvent parameter", POLYMERS FOR ADVANCED TECHNOLOGIES, (2011), 22, 915-923.

35- Malvadkar N., Demirel G., Poss M., Javed A., Dresick W.J., Demirel M.C., “Fabrication and Use of Electroless Plated  Polymer Surface Enhanced Raman Spectroscopy  Substrates for Viral Gene Detection”,  JOURNAL OF PHYSICAL CHEMISTRY C, (2010), 114, 10730-10738.

34- Gozde I., Demirel G, Gleason K.K, Demirel M.C., “Highly Swellable Free-Standing Hydrogel Nanotubes Forest”, SOFT MATTER, (2010), 6, 1635-1639.

33- Demirel G., Malvadkar N. Demirel M.C.,” Control of protein adsorption onto core-shell tubular and vesicular structures of diphenylalanine/Parylene”, LANGMUIR, (2010), 26, 1460-1463.

32- Demirel G., Malvadkar N., Demirel M.C.,Template-based and Template-Free Oblique Angle Polymerization”, THIN SOLID FILMS, (2010), 518, 4252-4255.

31- Duman M., Çağlayan M.O., Demirel G., Piksin E., “Detection of Mycobacterium tuberculosis Complex Using Surface Plasmon Resonance Based Sensors Carrying Self-Assembled Nano-Overlayers of Probe Oligonucleotide”, SENSOR LETTERS, (2009), 7, 535-542.

30- Çağlayan M.O., Demirel G., Sayar F., Otman B., Çelen B., Pişkin E., “Stepwise formation approach to improve ellipsometric biosensor response”, NANOMEDICINE, (2009), 5, 152-161.

29- Çimen D., Demirel G., Çaykara T., “Hemoglobin recognition of molecularly imprinted hydrogels prepared at different pHs”, REACTIVE AND FUCTIONAL POLYMERS, (2009), 69, 655-659.

28- Akkaya B., Şahin F., Demirel G., Tümtürk H., “Functional Polymeric supports for Immobilization of Cholestrol Oxidase”, BIOCHEMICAL ENGINEERING JOURNAL, (2009), 43, 333-337.

27- Demirel G., Rzaev Z., Patir S., Piskin E., “Poly(N-isopropylacrylamide) layers on Silicon wafers as smart DNA-sensors platforms”, JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, ( 2009), 9, 1865-1871.

26- Uysal A., Demirel G., Turan E., Çaykara T.,Dependence of fibrinogen recognition of molecularly imprinted hydrogels  on preparation pH”, ANALITICA CHIMICA ACTA,( 2008), 625, 110-115 .

25- Piskin E., Demirel G., Rzaev Z., Pair S., “Smart "temperature responsive'' self-assembled monolayers”, TISSUE ENGINEERING PART A, (2008), 14(5), 778.
24- Odabas S., Garipcan B., Demirel G., Burger J., Nabet B., Spanier J., Piskin E., “In vitro biocompatibility of plain and doped silicon nanowires”, TISSUE ENGINEERING PART A, (2008), 14(5), 863-864.
  
23- Demirel G., Çağlayan M.O., Garipcan B., Pişkin E., “A Novel DNA Biosensor Based on Ellipsometry”, SURFACE SCIENCE, ( 2008), 602, 952-958.

22-Tümtürk H., Demirel G., Altınok H., Aksoy S., Hasirci N., “Immobilization of glucose isomerase in surface-modified alginate gel beads”, JOURNAL OF FOOD BIOCHEMISTRY, (2008), 32, 234-246.

21- Demirel G., Cakmak M., Caykara T., “Chemisorption of 3-aminopropyltrimethoxysilane on Si(001)-2x2", JOURNAL OF PHYSICAL CHEMISTRY C,(2007), 111, 15020-15025.

20- Demirel G., Çaykara T, Akaoğlu B, Çakmak M., “The Construction of A Novel Multilayer System and Its Use for the oriented immobilization of immunoglobulin G”, SURFACE SCIENCE, (2007), 601, 4563-4570.

19- Birlik G., Demirel G., Çakmak M., Çaykara T., “Chemisorption of 4-(4-Amino-phenylazo) benzoic acid molecule on the Si(001)-(4x2) surface”, SURFACE SCIENCE, (2007), 601, 3760-3764.

18- Demirel G., Birlik G., Çakmak M., Ellialtıoglu Ş., Çaykara T., “Atomic and electronic structure of 3-aminopropyltrimethoxysilane on Si(111)-R3xR3”, SURFACE SCIENCE, (2007), 601, 3740-3744.

17- Demirel G., Çağlayan M.O., Garipcan B., Duman M., Pişkin E.,” Oriented immobilization of IgG on hydroxylated Si(001) surfaces via protein-A by a multiple-step process based on a self-assembly approach”, JOURNAL OF MATERIALS SCIENCE, (2007), 42, 9402-9408.

16- Demirel G., Çağlayan M.O., Garipcan B., Duman M., Pişkin E., “Formation and Organization of Amino Terminated Self-Assembled Layers on Si(001) Surface”, NANOSCALE RESEARCH LETTERS, (2007), 2, 350-354.

15- Demirel G., Çakmak M., Çaykara T., “Binding formation of 12-hydroxydodecanoic acid on Si(001)-(2x2)”, JOURNAL OF PHYSICAL CHEMISTRY C, (2007), 111, 4375-4378.

14- Tümtürk H., Şahin F., Demirel G., “A New Method for Immobilization of Acetylcholinesterase”, BIOPROCESS AND BIOSYSTEMS ENGINEERING, (2007), 30, 141-145.

13- Çaykara T., Kiper S., Demirel G., Demirci S., Cakanyıldırım C., “Thermo-Responsive Characteristics of Poly(N-isopropylacrylamide) Hydrogels with Macroporous Structure”, POLYMER INTERNATIONAL,  (2007), 56, 275-282.

12- Tümtürk H., Karaca N., Demirel G., Şahin F., "Preperation and Application of Poly(N,N-dimethylacrylamide-co-acrylamide) and Poly(N-isopropylacrylamide-co-acrylamide)/κ-Carrageenan Hydrogels Immobilization of Lipase", INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES, (2007), 40, 281-285.

11- Demirel G., “Adsorption of bovine serum albumin by using pH and temperature sensitive poly(N-t-butylacrylamide-co-acrylamide) ionic hydrogels”, JOURNAL OF POLYMER RESEARCH,  (2007), 14, 23-30.

10- Kara F., Demirel G., Tümtürk H., "Immobilization of urease by using chitosan–alginate
and poly(acrylamide-co-acrylic acid)/kappa-carrageenan supports", BIOPROCESS AND BIOSYSTEMS ENGINEERING, (2006), 29, 207-211.

9- Turan E., Demirel G., Zengin M., Simsek D., Çaykara T., “pH-Dependent Swelling Behavior and Network Parameters of ionic Poly(N-tert-butylacrylamide-co-acrylamide) Hydrogels”, JOURNAL OF APPLIED POLYMER SCINCE, (2006), 102, 1624-1630.

8- Çaykara T., Kiper S., Demirel G., “Network parameters and volume phase transition behavior of poly(N-isopropylacrylamide) hydrogels”, JOURNAL OF APPLIED POLYMER SCIENCE, (2006), 101, 1756-1762.

7- Çaykara T., Kiper S., Demirel G., “Thermosensitive poly(N-isopropylacrylamide-co-acrylamide) hydrogels: synthesis, swelling and interaction with ionic surfactants”, EUROPEAN POLYMER JOURNAL, (2006), 42, 348-355.

6- Şahin F., Demirel G., Tümtürk H., “A novel matrix for the immobilization of acetylcholinesterase”, INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES, (2005), 37, 148-153.

5- Demirel G., Özçetin G., Şahin F., Tümtürk H., Aksoy S., Hasırcı N., “Semi-interpenetrating polymer networks (IPNs) for entrapment of glucose isomerase”, REACTIVE AND FUNCTIONAL POLYMERS, (2006), 66, 389-394.

4- Demirel G., Özçetin G., Turan E., Çaykara T., “pH/temperature  sensitive imprinted ionic poly(N-t-butylacrylamide-co-acrylamide) hydrogels for bovine serum albumin”, MACROMOLECULAR BIOSCIENCE, (2005), 5, 1032-1037.

3- Yahşi A., Şahin F., Tümtürk H., Demirel G., “Binary immobilization of tyrosinase by using alginate gel beads and poly(acrylamide-co-acrylicacid) hydrogels”, INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES, (2005), 36, 253-258.

2- Yaykaşlı K, Demirel G, Yaşar A., “Influence of alcohols on citric acid production by Aspergillus niger A-9 entrapped in polyacrylamide gels”, JOURNAL OF FOOD ENGINEERING, (2005), 70(4), 518-522.


1- Demirel G., Yaykaşlı K. Yaşar A.,“The production of citric acid by using immobilized Aspergillus niger A-9 and investigation of the various effects on citric acid production” FOOD CHEMISTRY, (2005), 89, 393-396.

BOOK CHAPTERS:
1- Erhan Pişkin, Gokhan Demirel, Bora Garipcan, M. Oguzhan Caglayan, “Patterning Techniques for Array Platforms” in Detection of Highly Dangerous Pathogens: Microarray Methods for BSL 3 and BSL 4 Agents, Wiley-VCH, 65-82, 2009 (ISBN: 978-3-527-32275-6).

2- Garipcan B., Caglayan M.O., Demirel G., " A new generation Biosensors Based on Ellipsometry" in New Perspectives in Biosensors Technology and Applications, Intech Publishing Group, 197-214, 2011 (ISBN: 978-953-307-448-1).

PATENTS:
1- Demirel, G., Kubus, L., Piskin, E. "Plasmon-Enhanced Directional Catalytic Surfaces Through Oblique Angle Deposition Technique", Republic of Turkey Patent Institute, 2012-05385.

2- Demirel, G., Babür, E. “A Method for The Fabrication of Paper-Based Sensor Platforms via Vapor Phase Polymerization”, Republic of Turkey Patent Institute, 2013/10274.


"The important thing in science is not so much to obtain new facts as to discover new ways of thinking about them" Sir William Law...