Mohammad Mehdi Shahjamali

Mohammad Mehdi Shahjamali
Harvard University | Harvard · Harvard John A. Paulson School of Engineering and Applied Sciences

Doctor of Philosohy, Materials Science

About

28
Publications
6,254
Reads
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1,214
Citations
Introduction
I am currently a postdoctoral fellow in Prof. Chad Mirkin Group at Department of Chemistry and International Institute for Nanotechnology, Northwestern University. My research topics include: • Anisotropic plasmonic nanostructure: synthesis and surface modification • Colloidal-nanoparticle-superlattice engineered with DNA • Self-assembly approaches for nanoelectronic and nanophotonic • Colloidal and interface chemistry
Additional affiliations
August 2013 - April 2015
Northwestern University
Position
  • PostDoc Position
January 2012 - March 2012
Nanyang Technological University
Position
  • Tutor , MS3081 Laboratory ,Synthesis of Colloidal Gold Nanoparticles
Description
  • 3rd-year Bachelor Module, Nanyang Technological University
August 2011 - January 2012
Nanyang Technological University
Position
  • Ultrathin Gold Nanoframe Synthesis

Publications

Publications (28)
Article
Full-text available
Nanocomposites of metal nanoparticles (NPs) and bacterial nanocellulose (BC) enable fabrication of soft and biocompatible materials for optical, catalytic, electronic, and biomedical applications. Current BC–NP nanocomposites are typically prepared by in situ synthesis of the NPs or electrostatic adsorption of surface functionalized NPs, which limi...
Article
Full-text available
The integrated circuit (IC) chips are essential components in a variety of computing systems ranging from consumer electronics to high-security military devices. Hence, the authenticity of ICs is crucial. The pervasive nature of ICs and the need for their low-cost production has led to the globalization of IC design and manufacturing process, which...
Article
Bimetallic hollow, porous noble metal nanoparticles are of broad interest for biomedical, optical and catalytic applications. The most straightforward method for preparing such structures involves the reaction between HAuCl4 and well-formed Ag particles, typically spheres, cubes, or triangular prisms, yet the mechanism underlying their formation is...
Article
Full-text available
Recently, Ag-Ag2S hybrid nanostructures have attracted a great deal of attention due to their enhanced chemical and thermal stability, in addition to their morphology- and composition-dependent tunable local surface plasmon resonances. Although Ag-Ag2S nanostructures can be synthesized via sulfidation of as-prepared anisotropic Ag nanoparticles, th...
Article
Shape-controlled synthesis of gold nanoparticles generally involves the use of surfactants, typically cetyltrimethylammonium (CTAX, X = Cl(-) , Br(-) ), to regulate the nucleation growth process and to obtain colloidally stable nanoparticles. The surfactants adsorb on the nanoparticle surface making further functionalization difficult and therefore...
Article
The concept of using cantilever-free scanning probe arrays as structures that can modulate nanoscale ink flow and composition with light is introduced and evaluated. By utilizing polymer pen arrays with an opaque gold layer surrounding the base of the transparent polymer pyramids, we show that inks with photopolymerizable or isomerizable constituen...
Article
A facile, high-yield synthesis of edge gold-coated silver nanoprisms (GSNPs) with a gold nanoframe as thin as 1.7 nm and their comprehensive characterizations by using various spectroscopic and microscopic techniques is introduced. The GSNPs exhibit remarkably higher stability than silver nanoprisms (SNPs) and are therefore explored as effective op...
Article
The bulk refractive index (RI) sensitivity of dispersed and immobilized silver nanoparticles of three different shapes (spheres, cubes, and plates) is investigated. We demonstrate, both experimentally and theoretically, that the influence of immobilization on the RI sensitivity is highly dependent on the shape of the nanoparticles. A strong correla...
Article
We report a facile synthetic route for edge-gold-coated silver nanoprisms (GSNPs) and their comprehensive optical and structural characterization. The GSNPs exhibit remarkably high stability toward chemical etching and excellent performance as both optical antennae for light-harvesting applications and refractive index sensors. We show that when em...
Article
Bulk and surface refractive index sensitivity for localized surface plasmon resonance (LSPR) sensing based on edge gold-coated silver nanoprisms (GSNPs) and gold nanospheres was investigated and compared with conventional surface plasmon resonance (SPR) sensing based on propagating surface plasmons. The hybrid GSNPs benefit from an improved stabili...
Article
Ultrathin triangular gold nanoframes are synthesized in high yield through selective gold deposition on the edges of triangular silver nanoprisms and subsequent silver etching with mild wet etchants. These ultrathin gold nanoframes are surfactant-free with tailorable ridge thickness from 1.8 to 6 nm and exhibit adjustable and distinct surface plasm...
Article
Well dispersed CdS quantum dots were successfully grown in-situ on g-C3N4 nanosheets through a solvothermal method involving dimethyl sulfoxide. The resultant CdS–C3N4 nanocomposites exhibit remarkably higher efficiency for photocatalytic hydrogen evolution under visible light irradiation as compared to pure g-C3N4. The optimal composite with 12 wt...
Article
The mesoporous Au–TiO2 nanocomposites with different Au concentrations were prepared via a co-polymer assisted sol–gel method. The structures have been characterized by powder X-Ray diffraction, N2 adsorption–desorption isotherms, diffuse reflectance UV–Vis spectroscopy, X-ray photoemission spectroscopy, transmission electron microscopy. Most gener...
Article
Full-text available
Gold nanoparticles are successfully grown in situ on α-Fe2O3 nanocrystals through a cysteine-linked seed-planting approach followed by photo-assisted growth. The size of the gold particles on α-Fe2O3 nanocrystals can be further tuned from 2 to 20 nm by using photoinduced seed-mediation strategy. The formed Au-α-Fe2O3 hetero-nanoparticles are highly...
Article
Full-text available
We demonstrate plasmon-enhanced hydrogen evolution from photocatalytic water reduction using Au-InVO 4 hybrid micro-spheres. The surface plasmons of gold nanoparticles enhance the sub-band gap excitation of InVO 4 and promote charge separation on its surface through plasmon-exciton coupling, thereby significantly improving their photocatalytic effi...
Article
Core–shell Ag@Au nanoprisms are prepared through a surfactant-free seed-mediated approach by taking advantage of the anisotropic structure of silver nanoprisms as seeds. The gold coating on the silver nanoprism surface is achieved by using hydroxylamine as a mild reducing agent, and the final fully gold-coated prism structures are confirmed by micr...
Article
Core–shell Ag@Au nanoprisms are prepared through a surfactant-free seed-mediated approach by taking advantage of the anisotropic structure of silver nanoprisms as seeds. The gold coating on the silver nanoprism surface is achieved by using hydroxylamine as a mild reducing agent, and the final fully gold-coated prism structures are confirmed by micr...
Conference Paper
Full-text available
In this paper we describe a facile method for synthesizing gold triangular nanoframe from edge gold-coated silver nanoprism [Ag@(Au nanoframe)] with controlled ridge thickness and interior hollow diameter via chemical etching of silver from the gold coated Ag nanoprism with Hydrogen peroxide. Our process involves two major steps: (1) Formation of A...
Article
Full-text available
ZnSb nanotubes were grown through a template free electrodeposition method under over-potential conditions. The growth of the nanotubes was attributed to the template effect from H(2) bubbles. Due to their hollow structure, the ZnSb nanotubes depicted better Li ion storage performance compared to that of ZnSb nanoparticles deposited under different...
Article
A single-step fabrication of ZnSb nanostructures using template-free electrochemical deposition was developed. Results have indicated that ZnSb nanoflakes, nanowires, or nanoparticles with controlled composition could be obtained by adjusting the precursor concentration, applied voltage, and substrate type. The ZnSb nanostructures deposited on Cu f...
Conference Paper
Full-text available
Novel Triangular Ag@AgAu nanoparticles were synthesized in aqueous solution using a seed-mediated approach in the absence of any surfactants. The formation of the gold layer on the silver nanoprism seeds leads to structures with better stability and tunability. The triangular Ag@AgAu has been synthesized by the reduction of hydrogen tetrachloraurat...

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