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Timothy Tyler Daugherty

Bio: Timothy Tyler Daugherty is an academic researcher from University of Georgia. The author has contributed to research in topics: OLED & Spintronics. The author has an hindex of 2, co-authored 2 publications receiving 74 citations.

Papers
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Journal ArticleDOI
TL;DR: In this article, the authors present major experimental results on OMAR studies and current understanding of OMAR using several spin dependent processes in organic semiconductors, highlighting some of the outstanding challenges in this promising research field.

46 citations

Journal ArticleDOI
TL;DR: In this paper, the authors reviewed the major experimental and theoretical studies on the first organic spintronic subject, namely organic magnetoresistance (OMAR) in organic light emitting diodes (OLEDs).

34 citations

Journal ArticleDOI
TL;DR: The path analysis suggests that stigmatisation and social isolation might lead to depressive symptoms and early clinical identification of social isolation and public education demystifying CCLE could help reduce depression in patients with CCLE.
Abstract: Objective Depression is common in individuals with chronic cutaneous lupus erythematosus (CCLE). However, how CCLE may impact patients’ psychological well-being is poorly understood, particularly among disproportionally affected populations. We examined the relationships between depression and psychosocial factors in a cohort of predominantly Black patients with primary CCLE (CCLE without systemic manifestations). Methods Cross-sectional assessment of individuals with dermatologist-validated diagnosis of primary CCLE. NIH-PROMIS short-forms were used to measure depression, disease-related stigma, social isolation and emotional support. Linear regression analyses (ɑ=0.05) were used to test an a priori conceptual model of the relationship between stigma and depression and the effect of social isolation and emotional support on that association. Results Among 121 participants (87.6% women; 85.1% Black), 37 (30.6%) reported moderate to severe depression. Distributions of examined variables divided equally among those which did (eg, work status, stigma (more), social isolation (more), emotional support (less)) and did not (eg, age, sex, race, marital status) significantly differ by depression. Stigma was significantly associated with depression (b=0.77; 95% CI0.65 to 0.90), whereas social isolation was associated with both stigma (b=0.85; 95% CI 0.72 to 0.97) and depression (b=0.70; 95% CI0.58 to 0.92). After controlling for confounders, stigma remained associated with depression (b=0.44; 95% CI0.23 to 0.66) but lost significance (b=0.12; 95% CI −0.14 to 0.39) when social isolation (b=0.40; 95% CI 0.19 to 0.62) was added to the model. Social isolation explained 72% of the total effect of stigma on depression. Emotional support was inversely associated with depression in the univariate analysis; however, no buffer effect was found when it was added to the multivariate model. Conclusion Our findings emphasise the psychosocial challenges faced by individuals living with primary CCLE. The path analysis suggests that stigmatisation and social isolation might lead to depressive symptoms. Early clinical identification of social isolation and public education demystifying CCLE could help reduce depression in patients with CCLE.

2 citations


Cited by
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01 Mar 2004
TL;DR: In this paper, a self-aligned regioregular poly(3-hexylthiophene) (P3HT) has been used to control the intermolecular interaction at the interface between P3HT and the insulator substrate by using self-assembled monolayers (SAMs) functionalized with various groups (NH2, NH2, OH, and CH3).
Abstract: With the aim of enhancing the field-effect mobility by promoting surface-mediated two-dimensional molecular ordering in self-aligned regioregular poly(3-hexylthiophene) (P3HT) we have controlled the intermolecular interaction at the interface between P3HT and the insulator substrate by using self-assembled monolayers (SAMs) functionalized with various groups (–NH2, –OH, and –CH3). We have found that, depending on the properties of the substrate surface, the P3HT nanocrystals adopt two different orientations—parallel and perpendicular to the insulator substrate—which have field-effect mobilities that differ by more than a factor of 4, and that are as high as 0.28 cm2 V–1 s–1. This surprising increase in field-effect mobility arises in particular for the perpendicular orientation of the nanocrystals with respect to the insulator substrate. Further, the perpendicular orientation of P3HT nanocrystals can be explained by the following factors: the unshared electron pairs of the SAM end groups, the π–H interactions between the thienyl-backbone bearing π-systems and the H (hydrogen) atoms of the SAM end groups, and interdigitation between the alkyl chains of P3HT and the alkyl chains of the SAMs.

391 citations

Journal ArticleDOI
07 Jun 2017
TL;DR: In this article, the authors highlight recent research in which small-molecule chirality has had an enabling impact in technological applications, including the detection and emission of chiral light, help to control molecular motion, or provide a means to control electron spin and bulk charge transport.
Abstract: Chirality is a fundamental symmetry property; chiral objects, such as chiral small molecules, exist as a pair of non-superimposable mirror images. Although small-molecule chirality is routinely considered in biologically focused application areas (such as drug discovery and chemical biology), other areas of scientific development have not considered small-molecule chirality to be central to their approach. In this Review, we highlight recent research in which chirality has enabled advancement in technological applications. We showcase examples in which the presence of small-molecule chirality is exploited in ways beyond the simple interaction of two different chiral molecules; this can enable the detection and emission of chiral light, help to control molecular motion, or provide a means to control electron spin and bulk charge transport. Thus, we demonstrate that small-molecule chirality is a highly promising avenue for a wide range of technologically oriented scientific endeavours. Although it is a fundamental property of many small molecules, chirality is not widely exploited in materials applications as its benefits are not widely recognized — indeed, the need for stereoselective synthesis may be seen as a disadvantage. In this Review, we highlight recent research in which chirality has had an enabling impact in technological applications.

377 citations

Journal ArticleDOI
TL;DR: In this Perspective, inorganic/molecular interfaces are explored by looking closely at both sides of the interface and the interface is described as an ideal platform for creating new spin effects.
Abstract: This Perspective discusses the spin-dependent properties emerging at the interfaces of molecular and inorganic materials, and describes possible future developments for spin-based technologies. The miniaturization trend in the semiconductor industry has led to the understanding that interfacial properties are crucial for device behaviour. Spintronics has not been alien to this trend, and phenomena such as preferential spin tunnelling, the spin-to-charge conversion due to the Rashba–Edelstein effect and the spin–momentum locking at the surface of topological insulators have arisen mainly from emergent interfacial properties, rather than the bulk of the constituent materials. In this Perspective we explore inorganic/molecular interfaces by looking closely at both sides of the interface. We describe recent developments and discuss the interface as an ideal platform for creating new spin effects. Finally, we outline possible technologies that can be generated thanks to the unique active tunability of molecular spinterfaces.

289 citations

Journal Article
TL;DR: In this paper, a detailed description of spin injection and detection in semiconductor heterostructures for temperatures from 2 to 295 K was presented, and the spin injection efficiency of the Schottky barrier decreases at higher temperatures, although a steady state spin polarization of at least 6% is observed at 295 K.
Abstract: We present a detailed description of spin injection and detection in $\\mathrm{Fe}∕{\\mathrm{Al}}_{x}{\\mathrm{Ga}}_{1\\ensuremath{-}x}\\mathrm{As}∕\\mathrm{GaAs}$ heterostructures for temperatures from 2 to 295 K. Measurements of the steady-state spin polarization in the semiconductor indicate three temperature regimes for spin transport and relaxation. At temperatures below 70 K, spin-polarized electrons injected into quantum well structures form excitons, and the spin polarization in the quantum well depends strongly on the electrical bias conditions. At intermediate temperatures, the spin polarization is determined primarily by the spin-relaxation rate for free electrons in the quantum well. This process is slow relative to the excitonic spin-relaxation rate at lower temperatures and is responsible for a broad maximum in the spin polarization between 100 and 200 K. The spin injection efficiency of the $\\mathrm{Fe}∕{\\mathrm{Al}}_{x}{\\mathrm{Ga}}_{1\\ensuremath{-}x}\\mathrm{As}$ Schottky barrier decreases at higher temperatures, although a steady-state spin polarization of at least 6% is observed at 295 K.

125 citations

Journal ArticleDOI
TL;DR: For the progressive development of spintronics as the next generation information technology source, it is essential to look for materials with high abundance, long spin lifetime, easy manipulation, etc. as mentioned in this paper.
Abstract: For the progressive development of spintronics as the next generation information technology source, it is essential to look for materials with high abundance, long spin lifetime, easy manipulation...

110 citations