Search or add a thesis

Advanced Search (Beta)
Home > Synthesis and Potential Applications of Advanced Materials: Tmds and Polyazomethine Composites

Synthesis and Potential Applications of Advanced Materials: Tmds and Polyazomethine Composites

Thesis Info

Access Option

External Link

Author

Naz, Mehwish

Program

PhD

Institute

Quaid-I-Azam University

City

Islamabad

Province

Islamabad.

Country

Pakistan

Thesis Completing Year

2018

Thesis Completion Status

Completed

Subject

Inorganic/Analytical Chemistry

Language

English

Link

http://prr.hec.gov.pk/jspui/bitstream/123456789/10579/1/Mehwish_Naz_Inorganic_Analy_Chem_2018_QAU_10.07.2019.pdf

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676727472780

Asian Research Index Whatsapp Chanel
Asian Research Index Whatsapp Chanel

Join our Whatsapp Channel to get regular updates.

Similar


Two-dimensional layered transition metal dichalcogenides (TMDs) are fundamentally and technologically intriguing materials. The versatile and tunable properties of these materials make them attractive for compendium of applications. Emerging transition metal dichalcogenides offer unique and hitherto unavailable opportunities to tailor the mechanical, thermal, electronic and optical properties of polyazomethine based composites. Phase conversion of the transition metal dichalcogenides from 2H phase to 2H''/1T was carried out by organolithium treatment of MoS2 and MoSe2 polycrystalline films on the chips. The conversion was done successfully on the particular area yielding a lateral heterostructure concerning the pristine 2H phase and the 2H''/1T co-phase regions. Lateral heterostructure was verified by Raman spectroscopic, X-ray photoelectron spectroscopic studies and X-ray diffraction analysis. Scanning electron (SEM) and atomic force (AFM) microscopies revealed the changes in the surface morphology and work function of the heterostructure in comparison to the pristine films. Phase stability studies of the heterostructure were also studied by Raman spectroscopic studies.Gas sensing and electrical properties were also performed on these chips. Functionalization route was demonstrated that results in ethylene glycol bonded to the MoSe2 surface via covalent C–Se bond. It was based on lithium intercalation, quenching of the negative charges residing on the MoSe2 by electrophiles such as bromo diazonium salts and subsequently proceeding with ethylene glycol via cross coupling reaction.FTIR and (1H and 13C) NMR spectroscopic analyses techniques were used for structure elucidation. Strong evidence for the existence of heterostructure 2H''/1T of MoSe2 after the effective grafting of C– O linkage on the MoSe2 surface was confirmed by wide angle X-ray diffraction (XRD) and Xray photoelectron spectroscopic studies (XPS). Thermal stability of the synthesized product was ensured by the thermogravimetric analysis (TGA). Surface morphology was also probed by scanning electron microscopic studies (SEM). Further strategy of modifying TMDs with amine-terminated polyazomethines (PAs) was successfully offers a scalable platform suitable for tuning the properties of flexible PAs TMDs composite. TMDs (MoS2, MoSe2, WS2 and WSe2) were properly embedded in the polymer matrix. Bifunctional aldehyde monomers containing sulphone linkage were synthesized and subsequently confirmed by FT-IR and (1H and 13C) NMR spectroscopic studies and then treated with two different diamines to prepare six polyazomethines via polycondensation method in acidic media. Synthesized polyazomethines were confirmed by FT-IR and (1H and 13C) NMR spectroscopic analysis. Furthermore, in another attempt, the ethoxy pendant group was also attached to the linear polyazomethines. Synthesized poly- azomethines (PAs) were further doped with TMDs material and characterized by FTIR, Raman and XPS spectroscopic studies. Scanning electron and transmission electron microscopic studies revealed changes in the surface morphology. Energy dispersive X-ray spectroscopy (EDX) was also done using the TEM setup. UV-Visible and fluorescence spectroscopic technique were also performed to study the photophysical behavior. Electrocatalytic activity was also performed on these composite materials. In addition, synthesized polyazomethines were covalently grafted onto acid functionalized MCNTs. The synthesized nanocomposite materials were consequently characterized by spectroscopic studies (FT-IR, Raman spectroscopic studies). X-ray diffraction (XRD) and Xray photoelectron (XPS) spectroscopic studies were also performed. Scanning electron and transmission electron microscopic studies revealed modifications in the surface morphology. A current voltage measurements and electrocatalytic activity were also performed on these PAs-MCNTs composites. This perspective concerns the synthetic strategies that have been used to incorporate PAs into TMDs and grafting onto MCNT’s surface can improve their performance in technological applications.
Loading...
Loading...

Similar Books

Loading...

Similar Chapters

Loading...

Similar News

Loading...

Similar Articles

Loading...

Similar Article Headings

Loading...

عبدالباقی [مدیر ہفت روزہ کاروانِ وطن ]

عبدالباقی
۲۵؍ فروری کے الجمعیتہ میں پہلے صفحہ کی پہلی اور نمایاں خبر میں عبدالباقی، مدیر ہفت روزہ ’’کاروانِ وطن ‘‘کے حادثۂ وفات کی اطلاع اچانک پڑھی توجی دھک سے ہوکر رہ گیا۔ اب ادھر تیس بتیس برس سے تو ہم دونوں ایسے تھے کہ گویا کبھی رسم و راہ ہی نہیں تھی۔ برس دو برس میں راہ چلتے یاکسی پارٹی یاجلسہ میں مڈبھیڑ ہوگئی تورسمی طور پرعلیک سلیک اور مزاج پرسی ہوئی اور ہم دونوں نے اپنی اپنی راہ لی۔چنانچہ اسی نوع کی مرحوم سے آخری ملاقات پچھلے دنوں جامعہ اسلامیہ کے جلسۂ تقسیم ِ اسناد کے موقع پرہوئی تھی۔جلسہ کے ختم پر عصرانہ کاانتظام تھا۔ صدر جمہوریہ ڈاکٹر ذاکرحسین صاحب ایک چھوٹے سے شامیانہ کے نیچے جامعہ کے وائس چانسلر مجیب صاحب اوردوچار اور معززمہمانوں کے ساتھ چائے نوشی سے فارغ ہوکر جب اپنے پرانے دوستوں، رفقائے کاراور ہم چشموں کے ساتھ میل ملاقات کی غرض سے مجمع عام میں داخل ہوئے تو عبدالباقی مرحوم میرے قریب کھڑے ہوئے تھے ۔ذاکر صاحب نے پہلے مجھ سے مصافحہ کیا اور خیریت پوچھی، پھرباقی صاحب کی طرف فرشتوں کی سی معصوم مسکراہٹ کے ساتھ متوجہ ہوئے ۔مصافحہ کیا اور دریافت فرمایا:’’کہیے باقی صاحب !آج کل آپ کیا کر رہے ہیں‘‘۔باقی صاحب ایک نیم خنداں کیفیت کے ساتھ بولے ! ’’ایک ہفت روزہ اخبار نکال رہاہوں،’’کاروانِ وطن ‘‘ اس کانام ہے‘‘ ۔ یہ سن کر ذاکر صاحب آگے بڑھ گئے ۔تھوڑی دیر کے بعد مجمع منتشر ہوگیااور سب اپنی اپنی راہ چل پڑے ۔اُس وقت خیال بھی نہیں ہوسکتا تھاکہ یہ باقی صاحب سے آخری بازدید اور ملاقات ہے۔اِنَّا لِلّٰہِ وَاِنَّا اِلَیْہِ رَاجِعُوْن ۔
ہاں تواِدھر تیس پینتیس برس سے مرحوم سے جان پہچان کچھ واجبی سی رہ گئی تھی۔ ورنہ اس سے قبل جب کہ وہ نئے نئے میدانِ صحافت میں اُترے تھے ہم دونوں اور تیسرے...

عالمی امن میں اسلام کا کردار

We live in a global village. The cyber world has brought together people and shurnk the distences, yet multi cultural, multi ethinic and multi national has become the norm of the day. There is virtually no such place, no town, no village, city or state where people from diverse backgrounds speaking diffirent lagnuages and professing diffirent creeds live. This diveristy and variety is the essence of life.  This paper analyzes various ways of establishing peace in the light of Islamic teachings. It finds out the causes of quarrels and disputes in different nations so that they may be prevented to make the world peaceful.

Genetic Diversity and Inheritance Studies of Yield and Quality Traits in Pisum Sativam L.

Among pulses, pea is an important legume crop which is not only the major source of proteins but also provide significant amount of carbohydrates, minerals and vitamin B complex. The current research work was planned to study genetic diversity among available pea germplasm and to evaluate inheritance pattern controlling seed yield related traits in Pisum sativum L. For this purpose 99 pea genotypes were field evaluated following RCBD replicated thrice. Data were taken for seed yield and its related traits. All the studied parameters showed significant amount of variation among genotypes. The cluster analysis classified 99 pea accessions into three clusters on the basis of genetic diversity of seed yield and its related traits. Eight accessions namely 19605, 20202, 26710, 20300, 19716, 20126, 26701 and 20153 were selected from cluster I and III for hybridization. Selected genotypes were crossed in 8×8 half diallel fashion excluding reciprocals to study the inheritance patterns for yield and quality traits. Twenty eight F1 crosses and parents were field evaluated during winter season 2015-2016 while F2 of all crosses was evaluated during winter season 2016-2017. Analysis of variance displayed significant amount of variation for all the studied parameters in both generations. The accession 20126 was good general combiner for number of branches per plant, biological yield, carotenoids contents and seed yield per plant in F1 generation while the accession 20153 was good general combiner for pod length, hundred fresh seed weight, hundred dry seed weight, harvest index and seed yield per plant in F2 generation. The cross combination 20202 × 26710 was good combination for pod length, pod width and seed yield per plant in F1 generation while the cross combination 19605 × 20202 was found best combination for seed yield per plant in F2 generation due to maximum significant and positive specific combining ability effects for seed yield per plant. The cross combination 20202 × 26710 showed maximum mid parent as well as better parent heterotic effects for pod length and seed yield per plant in F1 generation. The correlation analysis in F2 generation showed that number of branches per plant, pod length, biological yield and harvest index was significantly and positively correlated with seed yield per plant in Pisum sativum L. The cross combination 20202 × 26710 may be used as hybrid due to its higher specific combining ability variance and heterotic effects for seed yield per plant. Presence of non additive effects advocated the importance of heterosis breeding for development of high yielding varieties in pea.